Implement database storage layer

- Add connection pool configuration (pool_size, max_overflow, timeout, recycle) - Add transaction management utilities (transaction, savepoint, retry_on_deadlock) - Create repository pattern classes for all entities (Project, Package, Artifact, Tag, Upload) - Implement ref_count decrement and cleanup service - Add query helper functions (search, filtering, pagination, stats) - Add database constraints (check_ref_count_non_negative, check_size_positive) - Add performance indexes (idx_artifacts_ref_count, composite indexes for packages/tags) - Initialize Alembic migrations for future schema changes
Fix: restore enhanced tags API endpoints
2025-12-12 12:18:01 -06:00 · 2025-12-12 10:57:27 -06:00 · 2025-12-12 10:55:19 -06:00 · 2025-12-12 10:55:15 -06:00 · 2025-12-12 10:49:55 -06:00 · 2025-12-12 10:48:55 -06:00
43 changed files with 4036 additions and 183 deletions
--- a/README.md
+++ b/README.md
@@ -27,7 +27,13 @@ Orchard is a centralized binary artifact storage system that provides content-ad
 - **S3-Compatible Backend** - Uses MinIO (or any S3-compatible storage) for artifact storage
 - **PostgreSQL Metadata** - Relational database for metadata, access control, and audit trails
 - **REST API** - Full HTTP API for all operations
- **Web UI** - React-based interface for managing artifacts
+- **Web UI** - React-based interface for managing artifacts with:
+  - Hierarchical navigation (Projects → Packages → Tags/Artifacts)
+  - Search, sort, and filter capabilities on all list views
+  - URL-based state persistence for filters and pagination
+  - Keyboard navigation (Backspace to go up hierarchy)
+  - Copy-to-clipboard for artifact IDs
+  - Responsive design for mobile and desktop
 - **Docker Compose Setup** - Easy local development environment
 - **Helm Chart** - Kubernetes deployment with PostgreSQL, MinIO, and Redis subcharts
 - **Multipart Upload** - Automatic multipart upload for files larger than 100MB
@@ -56,10 +62,13 @@ Orchard is a centralized binary artifact storage system that provides content-ad
 | `POST` | `/api/v1/project/:project/:package/upload` | Upload an artifact |
 | `GET` | `/api/v1/project/:project/:package/+/:ref` | Download an artifact (supports Range header) |
 | `HEAD` | `/api/v1/project/:project/:package/+/:ref` | Get artifact metadata without downloading |
-| `GET` | `/api/v1/project/:project/:package/tags` | List all tags |
+| `GET` | `/api/v1/project/:project/:package/tags` | List tags (with pagination, search, sorting, artifact metadata) |
 | `POST` | `/api/v1/project/:project/:package/tags` | Create a tag |
+| `GET` | `/api/v1/project/:project/:package/tags/:tag_name` | Get single tag with artifact metadata |
+| `GET` | `/api/v1/project/:project/:package/tags/:tag_name/history` | Get tag change history |
+| `GET` | `/api/v1/project/:project/:package/artifacts` | List artifacts in package (with filtering) |
 | `GET` | `/api/v1/project/:project/:package/consumers` | List consumers of a package |
-| `GET` | `/api/v1/artifact/:id` | Get artifact metadata by hash |
+| `GET` | `/api/v1/artifact/:id` | Get artifact metadata with referencing tags |

 #### Resumable Upload Endpoints

@@ -290,12 +299,119 @@ curl -X POST http://localhost:8080/api/v1/project/my-project/releases/tags \
  -d '{"name": "stable", "artifact_id": "a3f5d8e12b4c6789..."}'
 ```

+### List Tags
+
+```bash
+# Basic listing with artifact metadata
+curl http://localhost:8080/api/v1/project/my-project/releases/tags
+
+# With pagination
+curl "http://localhost:8080/api/v1/project/my-project/releases/tags?page=1&limit=10"
+
+# Search by tag name
+curl "http://localhost:8080/api/v1/project/my-project/releases/tags?search=v1"
+
+# Sort by created_at descending
+curl "http://localhost:8080/api/v1/project/my-project/releases/tags?sort=created_at&order=desc"
+```
+
+Response includes artifact metadata:
+```json
+{
+  "items": [
+    {
+      "id": "uuid",
+      "package_id": "uuid",
+      "name": "v1.0.0",
+      "artifact_id": "a3f5d8e...",
+      "created_at": "2025-01-01T00:00:00Z",
+      "created_by": "user",
+      "artifact_size": 1048576,
+      "artifact_content_type": "application/gzip",
+      "artifact_original_name": "app-v1.0.0.tar.gz",
+      "artifact_created_at": "2025-01-01T00:00:00Z",
+      "artifact_format_metadata": {}
+    }
+  ],
+  "pagination": {"page": 1, "limit": 20, "total": 1, "total_pages": 1}
+}
+```
+
+### Get Single Tag
+
+```bash
+curl http://localhost:8080/api/v1/project/my-project/releases/tags/v1.0.0
+```
+
+### Get Tag History
+
+```bash
+curl http://localhost:8080/api/v1/project/my-project/releases/tags/latest/history
+```
+
+Returns list of artifact changes for the tag (most recent first).
+
+### List Artifacts in Package
+
+```bash
+# Basic listing
+curl http://localhost:8080/api/v1/project/my-project/releases/artifacts
+
+# Filter by content type
+curl "http://localhost:8080/api/v1/project/my-project/releases/artifacts?content_type=application/gzip"
+
+# Filter by date range
+curl "http://localhost:8080/api/v1/project/my-project/releases/artifacts?created_after=2025-01-01T00:00:00Z"
+```
+
+Response includes tags pointing to each artifact:
+```json
+{
+  "items": [
+    {
+      "id": "a3f5d8e...",
+      "size": 1048576,
+      "content_type": "application/gzip",
+      "original_name": "app-v1.0.0.tar.gz",
+      "created_at": "2025-01-01T00:00:00Z",
+      "created_by": "user",
+      "format_metadata": {},
+      "tags": ["v1.0.0", "latest", "stable"]
+    }
+  ],
+  "pagination": {"page": 1, "limit": 20, "total": 1, "total_pages": 1}
+}
+```
+
 ### Get Artifact by ID

 ```bash
 curl http://localhost:8080/api/v1/artifact/a3f5d8e12b4c67890abcdef1234567890abcdef1234567890abcdef12345678
 ```

+Response includes all tags/packages referencing the artifact:
+```json
+{
+  "id": "a3f5d8e...",
+  "size": 1048576,
+  "content_type": "application/gzip",
+  "original_name": "app-v1.0.0.tar.gz",
+  "created_at": "2025-01-01T00:00:00Z",
+  "created_by": "user",
+  "ref_count": 2,
+  "format_metadata": {},
+  "tags": [
+    {
+      "id": "uuid",
+      "name": "v1.0.0",
+      "package_id": "uuid",
+      "package_name": "releases",
+      "project_name": "my-project"
+    }
+  ]
+}
+```
+
 ## Project Structure

 ```
@@ -314,10 +430,21 @@ orchard/
 │   └── requirements.txt
 ├── frontend/
 │   ├── src/
-│   │   ├── components/         # React components
+│   │   ├── components/         # Reusable UI components
+│   │   │   ├── Badge.tsx       # Status/type badges
+│   │   │   ├── Breadcrumb.tsx  # Navigation breadcrumbs
+│   │   │   ├── Card.tsx        # Card containers
+│   │   │   ├── DataTable.tsx   # Sortable data tables
+│   │   │   ├── FilterChip.tsx  # Active filter chips
+│   │   │   ├── Pagination.tsx  # Page navigation
+│   │   │   ├── SearchInput.tsx # Debounced search
+│   │   │   └── SortDropdown.tsx# Sort field selector
 │   │   ├── pages/              # Page components
-│   │   ├── api.ts              # API client
-│   │   ├── types.ts            # TypeScript types
+│   │   │   ├── Home.tsx        # Project list
+│   │   │   ├── ProjectPage.tsx # Package list within project
+│   │   │   └── PackagePage.tsx # Tag/artifact list within package
+│   │   ├── api.ts              # API client with pagination support
+│   │   ├── types.ts            # TypeScript interfaces
 │   │   ├── App.tsx
 │   │   └── main.tsx
 │   ├── index.html
--- a/backend/alembic.ini
+++ b/backend/alembic.ini
@@ -0,0 +1,83 @@
+# Alembic Configuration File
+
+[alembic]
+# path to migration scripts
+script_location = alembic
+
+# template used to generate migration files
+# file_template = %%(rev)s_%%(slug)s
+
+# sys.path path, will be prepended to sys.path if present.
+prepend_sys_path = .
+
+# timezone to use when rendering the date within the migration file
+# as well as the filename.
+# If specified, requires the python-dateutil library
+# timezone =
+
+# max length of characters to apply to the "slug" field
+# truncate_slug_length = 40
+
+# set to 'true' to run the environment during the 'revision' command,
+# regardless of autogenerate
+# revision_environment = false
+
+# set to 'true' to allow .pyc and .pyo files without a source .py file
+# to be detected as revisions in the versions/ directory
+# sourceless = false
+
+# version location specification
+# version_locations = %(here)s/bar:%(here)s/bat:alembic/versions
+
+# version path separator
+# version_path_separator = :
+
+# set to 'true' to search source files recursively
+# in each "version_locations" directory
+# recursive_version_locations = false
+
+# the output encoding used when revision files are written from script.py.mako
+# output_encoding = utf-8
+
+# Database URL - will be overridden by env.py
+sqlalchemy.url = driver://user:pass@localhost/dbname
+
+
+[post_write_hooks]
+# post_write_hooks defines scripts or Python functions that are run
+# on newly generated revision scripts.
+
+# Logging configuration
+[loggers]
+keys = root,sqlalchemy,alembic
+
+[handlers]
+keys = console
+
+[formatters]
+keys = generic
+
+[logger_root]
+level = WARN
+handlers = console
+qualname =
+
+[logger_sqlalchemy]
+level = WARN
+handlers =
+qualname = sqlalchemy.engine
+
+[logger_alembic]
+level = INFO
+handlers =
+qualname = alembic
+
+[handler_console]
+class = StreamHandler
+args = (sys.stderr,)
+level = NOTSET
+formatter = generic
+
+[formatter_generic]
+format = %(levelname)-5.5s [%(name)s] %(message)s
+datefmt = %H:%M:%S
--- a/backend/alembic/README
+++ b/backend/alembic/README
@@ -0,0 +1,27 @@
+Alembic Migrations for Orchard
+
+This directory contains database migration scripts managed by Alembic.
+
+Common Commands:
+  # Generate a new migration (autogenerate from model changes)
+  alembic revision --autogenerate -m "description of changes"
+
+  # Apply all pending migrations
+  alembic upgrade head
+
+  # Rollback one migration
+  alembic downgrade -1
+
+  # Show current migration status
+  alembic current
+
+  # Show migration history
+  alembic history
+
+  # Generate SQL without applying (for review)
+  alembic upgrade head --sql
+
+Notes:
+- Always review autogenerated migrations before applying
+- Test migrations in development before applying to production
+- Migrations are stored in the versions/ directory
--- a/backend/alembic/env.py
+++ b/backend/alembic/env.py
@@ -0,0 +1,95 @@
+"""
+Alembic migration environment configuration.
+"""
+
+from logging.config import fileConfig
+import sys
+from pathlib import Path
+
+from sqlalchemy import engine_from_config
+from sqlalchemy import pool
+
+from alembic import context
+
+# Add the app directory to path for imports
+sys.path.insert(0, str(Path(__file__).parent.parent))
+
+from app.config import get_settings
+from app.models import Base
+
+# this is the Alembic Config object, which provides
+# access to the values within the .ini file in use.
+config = context.config
+
+# Get database URL from settings
+settings = get_settings()
+config.set_main_option("sqlalchemy.url", settings.database_url)
+
+# Interpret the config file for Python logging.
+# This line sets up loggers basically.
+if config.config_file_name is not None:
+    fileConfig(config.config_file_name)
+
+# add your model's MetaData object here
+# for 'autogenerate' support
+target_metadata = Base.metadata
+
+# other values from the config, defined by the needs of env.py,
+# can be acquired:
+# my_important_option = config.get_main_option("my_important_option")
+# ... etc.
+
+
+def run_migrations_offline() -> None:
+    """Run migrations in 'offline' mode.
+
+    This configures the context with just a URL
+    and not an Engine, though an Engine is acceptable
+    here as well.  By skipping the Engine creation
+    we don't even need a DBAPI to be available.
+
+    Calls to context.execute() here emit the given string to the
+    script output.
+
+    """
+    url = config.get_main_option("sqlalchemy.url")
+    context.configure(
+        url=url,
+        target_metadata=target_metadata,
+        literal_binds=True,
+        dialect_opts={"paramstyle": "named"},
+    )
+
+    with context.begin_transaction():
+        context.run_migrations()
+
+
+def run_migrations_online() -> None:
+    """Run migrations in 'online' mode.
+
+    In this scenario we need to create an Engine
+    and associate a connection with the context.
+
+    """
+    connectable = engine_from_config(
+        config.get_section(config.config_ini_section, {}),
+        prefix="sqlalchemy.",
+        poolclass=pool.NullPool,
+    )
+
+    with connectable.connect() as connection:
+        context.configure(
+            connection=connection,
+            target_metadata=target_metadata,
+            compare_type=True,  # Detect column type changes
+            compare_server_default=True,  # Detect default value changes
+        )
+
+        with context.begin_transaction():
+            context.run_migrations()
+
+
+if context.is_offline_mode():
+    run_migrations_offline()
+else:
+    run_migrations_online()
--- a/backend/alembic/script.py.mako
+++ b/backend/alembic/script.py.mako
@@ -0,0 +1,26 @@
+"""${message}
+
+Revision ID: ${up_revision}
+Revises: ${down_revision | comma,n}
+Create Date: ${create_date}
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+${imports if imports else ""}
+
+# revision identifiers, used by Alembic.
+revision: str = ${repr(up_revision)}
+down_revision: Union[str, None] = ${repr(down_revision)}
+branch_labels: Union[str, Sequence[str], None] = ${repr(branch_labels)}
+depends_on: Union[str, Sequence[str], None] = ${repr(depends_on)}
+
+
+def upgrade() -> None:
+    ${upgrades if upgrades else "pass"}
+
+
+def downgrade() -> None:
+    ${downgrades if downgrades else "pass"}
--- a/backend/app/config.py
+++ b/backend/app/config.py
@@ -18,6 +18,12 @@ class Settings(BaseSettings):
    database_dbname: str = "orchard"
    database_sslmode: str = "disable"

+    # Database connection pool settings
+    database_pool_size: int = 5  # Number of connections to keep open
+    database_max_overflow: int = 10  # Max additional connections beyond pool_size
+    database_pool_timeout: int = 30  # Seconds to wait for a connection from pool
+    database_pool_recycle: int = 1800  # Recycle connections after this many seconds (30 min)
+
    # S3
    s3_endpoint: str = ""
    s3_region: str = "us-east-1"
--- a/backend/app/database.py
+++ b/backend/app/database.py
@@ -1,7 +1,10 @@
-from sqlalchemy import create_engine, text
+from sqlalchemy import create_engine, text, event
 from sqlalchemy.orm import sessionmaker, Session
+from sqlalchemy.pool import QueuePool
 from typing import Generator
+from contextlib import contextmanager
 import logging
+import time

 from .config import get_settings
 from .models import Base
@@ -9,10 +12,44 @@ from .models import Base
 settings = get_settings()
 logger = logging.getLogger(__name__)

-engine = create_engine(settings.database_url, pool_pre_ping=True)
+# Create engine with connection pool configuration
+engine = create_engine(
+    settings.database_url,
+    pool_pre_ping=True,  # Check connection health before using
+    poolclass=QueuePool,
+    pool_size=settings.database_pool_size,
+    max_overflow=settings.database_max_overflow,
+    pool_timeout=settings.database_pool_timeout,
+    pool_recycle=settings.database_pool_recycle,
+)
+
 SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)


+# Connection pool monitoring
+@event.listens_for(engine, "checkout")
+def receive_checkout(dbapi_connection, connection_record, connection_proxy):
+    """Log when a connection is checked out from the pool"""
+    logger.debug(f"Connection checked out from pool: {id(dbapi_connection)}")
+
+
+@event.listens_for(engine, "checkin")
+def receive_checkin(dbapi_connection, connection_record):
+    """Log when a connection is returned to the pool"""
+    logger.debug(f"Connection returned to pool: {id(dbapi_connection)}")
+
+
+def get_pool_status() -> dict:
+    """Get current connection pool status for monitoring"""
+    pool = engine.pool
+    return {
+        "pool_size": pool.size(),
+        "checked_out": pool.checkedout(),
+        "overflow": pool.overflow(),
+        "checked_in": pool.checkedin(),
+    }
+
+
 def init_db():
    """Create all tables and run migrations"""
    Base.metadata.create_all(bind=engine)
@@ -62,6 +99,51 @@ def _run_migrations():
            END IF;
        END $$;
        """,
+        # Add ref_count index and constraints for artifacts
+        """
+        DO $$
+        BEGIN
+            -- Add ref_count index
+            IF NOT EXISTS (
+                SELECT 1 FROM pg_indexes WHERE indexname = 'idx_artifacts_ref_count'
+            ) THEN
+                CREATE INDEX idx_artifacts_ref_count ON artifacts(ref_count);
+            END IF;
+
+            -- Add ref_count >= 0 constraint
+            IF NOT EXISTS (
+                SELECT 1 FROM pg_constraint WHERE conname = 'check_ref_count_non_negative'
+            ) THEN
+                ALTER TABLE artifacts ADD CONSTRAINT check_ref_count_non_negative CHECK (ref_count >= 0);
+            END IF;
+        END $$;
+        """,
+        # Add composite indexes for packages and tags
+        """
+        DO $$
+        BEGIN
+            -- Composite index for package lookup by project and name
+            IF NOT EXISTS (
+                SELECT 1 FROM pg_indexes WHERE indexname = 'idx_packages_project_name'
+            ) THEN
+                CREATE UNIQUE INDEX idx_packages_project_name ON packages(project_id, name);
+            END IF;
+
+            -- Composite index for tag lookup by package and name
+            IF NOT EXISTS (
+                SELECT 1 FROM pg_indexes WHERE indexname = 'idx_tags_package_name'
+            ) THEN
+                CREATE UNIQUE INDEX idx_tags_package_name ON tags(package_id, name);
+            END IF;
+
+            -- Composite index for recent tags queries
+            IF NOT EXISTS (
+                SELECT 1 FROM pg_indexes WHERE indexname = 'idx_tags_package_created_at'
+            ) THEN
+                CREATE INDEX idx_tags_package_created_at ON tags(package_id, created_at);
+            END IF;
+        END $$;
+        """,
    ]

    with engine.connect() as conn:
@@ -80,3 +162,75 @@ def get_db() -> Generator[Session, None, None]:
        yield db
    finally:
        db.close()
+
+
+@contextmanager
+def transaction(db: Session):
+    """
+    Context manager for explicit transaction management with savepoint support.
+
+    Usage:
+        with transaction(db):
+            # operations here
+            # automatically commits on success, rolls back on exception
+    """
+    try:
+        yield db
+        db.commit()
+    except Exception:
+        db.rollback()
+        raise
+
+
+@contextmanager
+def savepoint(db: Session, name: str = None):
+    """
+    Create a savepoint for partial rollback support.
+
+    Usage:
+        with savepoint(db, "my_savepoint"):
+            # operations here
+            # rolls back to savepoint on exception, but doesn't rollback whole transaction
+    """
+    savepoint_obj = db.begin_nested()
+    try:
+        yield savepoint_obj
+        savepoint_obj.commit()
+    except Exception:
+        savepoint_obj.rollback()
+        raise
+
+
+def retry_on_deadlock(func, max_retries: int = 3, delay: float = 0.1):
+    """
+    Decorator/wrapper to retry operations on deadlock detection.
+
+    Usage:
+        @retry_on_deadlock
+        def my_operation(db):
+            ...
+
+    Or:
+        retry_on_deadlock(lambda: my_operation(db))()
+    """
+    import functools
+    from sqlalchemy.exc import OperationalError
+
+    @functools.wraps(func)
+    def wrapper(*args, **kwargs):
+        last_exception = None
+        for attempt in range(max_retries):
+            try:
+                return func(*args, **kwargs)
+            except OperationalError as e:
+                # Check for deadlock error codes (PostgreSQL: 40P01, MySQL: 1213)
+                error_str = str(e).lower()
+                if "deadlock" in error_str or "40p01" in error_str:
+                    last_exception = e
+                    logger.warning(f"Deadlock detected, retrying (attempt {attempt + 1}/{max_retries})")
+                    time.sleep(delay * (attempt + 1))  # Exponential backoff
+                else:
+                    raise
+        raise last_exception
+
+    return wrapper
--- a/backend/app/models.py
+++ b/backend/app/models.py
@@ -53,6 +53,7 @@ class Package(Base):
        Index("idx_packages_name", "name"),
        Index("idx_packages_format", "format"),
        Index("idx_packages_platform", "platform"),
+        Index("idx_packages_project_name", "project_id", "name", unique=True),  # Composite unique index
        CheckConstraint(
            "format IN ('generic', 'npm', 'pypi', 'docker', 'deb', 'rpm', 'maven', 'nuget', 'helm')",
            name="check_package_format"
@@ -84,6 +85,9 @@ class Artifact(Base):
    __table_args__ = (
        Index("idx_artifacts_created_at", "created_at"),
        Index("idx_artifacts_created_by", "created_by"),
+        Index("idx_artifacts_ref_count", "ref_count"),  # For cleanup queries
+        CheckConstraint("ref_count >= 0", name="check_ref_count_non_negative"),
+        CheckConstraint("size > 0", name="check_size_positive"),
    )


@@ -104,6 +108,8 @@ class Tag(Base):
    __table_args__ = (
        Index("idx_tags_package_id", "package_id"),
        Index("idx_tags_artifact_id", "artifact_id"),
+        Index("idx_tags_package_name", "package_id", "name", unique=True),  # Composite unique index
+        Index("idx_tags_package_created_at", "package_id", "created_at"),  # For recent tags queries
    )


--- a/backend/app/repositories/init.py
+++ b/backend/app/repositories/init.py
@@ -0,0 +1,22 @@
+"""
+Repository pattern implementation for data access layer.
+
+Repositories abstract database operations from business logic,
+providing clean interfaces for CRUD operations on each entity.
+"""
+
+from .base import BaseRepository
+from .project import ProjectRepository
+from .package import PackageRepository
+from .artifact import ArtifactRepository
+from .tag import TagRepository
+from .upload import UploadRepository
+
+__all__ = [
+    "BaseRepository",
+    "ProjectRepository",
+    "PackageRepository",
+    "ArtifactRepository",
+    "TagRepository",
+    "UploadRepository",
+]
--- a/backend/app/repositories/artifact.py
+++ b/backend/app/repositories/artifact.py
@@ -0,0 +1,157 @@
+"""
+Artifact repository for data access operations.
+"""
+
+from typing import Optional, List, Tuple
+from sqlalchemy.orm import Session
+from sqlalchemy import func, or_
+from uuid import UUID
+
+from .base import BaseRepository
+from ..models import Artifact, Tag, Upload, Package, Project
+
+
+class ArtifactRepository(BaseRepository[Artifact]):
+    """Repository for Artifact entity operations."""
+
+    model = Artifact
+
+    def get_by_sha256(self, sha256: str) -> Optional[Artifact]:
+        """Get artifact by SHA256 hash (primary key)."""
+        return self.db.query(Artifact).filter(Artifact.id == sha256).first()
+
+    def exists_by_sha256(self, sha256: str) -> bool:
+        """Check if artifact with SHA256 exists."""
+        return self.db.query(
+            self.db.query(Artifact).filter(Artifact.id == sha256).exists()
+        ).scalar()
+
+    def create_artifact(
+        self,
+        sha256: str,
+        size: int,
+        s3_key: str,
+        created_by: str,
+        content_type: Optional[str] = None,
+        original_name: Optional[str] = None,
+        format_metadata: Optional[dict] = None,
+    ) -> Artifact:
+        """Create a new artifact."""
+        artifact = Artifact(
+            id=sha256,
+            size=size,
+            s3_key=s3_key,
+            created_by=created_by,
+            content_type=content_type,
+            original_name=original_name,
+            format_metadata=format_metadata or {},
+            ref_count=1,
+        )
+        self.db.add(artifact)
+        self.db.flush()
+        return artifact
+
+    def increment_ref_count(self, artifact: Artifact) -> Artifact:
+        """Increment artifact reference count."""
+        artifact.ref_count += 1
+        self.db.flush()
+        return artifact
+
+    def decrement_ref_count(self, artifact: Artifact) -> Artifact:
+        """
+        Decrement artifact reference count.
+        Returns the artifact with updated count.
+        Does not delete the artifact even if ref_count reaches 0.
+        """
+        if artifact.ref_count > 0:
+            artifact.ref_count -= 1
+            self.db.flush()
+        return artifact
+
+    def get_orphaned_artifacts(self, limit: int = 100) -> List[Artifact]:
+        """Get artifacts with ref_count = 0 (candidates for cleanup)."""
+        return (
+            self.db.query(Artifact)
+            .filter(Artifact.ref_count == 0)
+            .limit(limit)
+            .all()
+        )
+
+    def get_artifacts_without_tags(self, limit: int = 100) -> List[Artifact]:
+        """Get artifacts that have no tags pointing to them."""
+        # Subquery to find artifact IDs that have tags
+        tagged_artifacts = self.db.query(Tag.artifact_id).distinct().subquery()
+
+        return (
+            self.db.query(Artifact)
+            .filter(~Artifact.id.in_(tagged_artifacts))
+            .limit(limit)
+            .all()
+        )
+
+    def find_by_package(
+        self,
+        package_id: UUID,
+        page: int = 1,
+        limit: int = 20,
+        content_type: Optional[str] = None,
+    ) -> Tuple[List[Artifact], int]:
+        """Find artifacts uploaded to a package."""
+        # Get distinct artifact IDs from uploads
+        artifact_ids_subquery = (
+            self.db.query(func.distinct(Upload.artifact_id))
+            .filter(Upload.package_id == package_id)
+            .subquery()
+        )
+
+        query = self.db.query(Artifact).filter(Artifact.id.in_(artifact_ids_subquery))
+
+        if content_type:
+            query = query.filter(Artifact.content_type == content_type)
+
+        total = query.count()
+        offset = (page - 1) * limit
+        artifacts = query.order_by(Artifact.created_at.desc()).offset(offset).limit(limit).all()
+
+        return artifacts, total
+
+    def get_referencing_tags(self, artifact_id: str) -> List[Tuple[Tag, Package, Project]]:
+        """Get all tags referencing this artifact with package and project info."""
+        return (
+            self.db.query(Tag, Package, Project)
+            .join(Package, Tag.package_id == Package.id)
+            .join(Project, Package.project_id == Project.id)
+            .filter(Tag.artifact_id == artifact_id)
+            .all()
+        )
+
+    def search(self, query_str: str, limit: int = 10) -> List[Tuple[Tag, Artifact, str, str]]:
+        """
+        Search artifacts by tag name or original filename.
+        Returns (tag, artifact, package_name, project_name) tuples.
+        """
+        search_lower = query_str.lower()
+        return (
+            self.db.query(Tag, Artifact, Package.name, Project.name)
+            .join(Artifact, Tag.artifact_id == Artifact.id)
+            .join(Package, Tag.package_id == Package.id)
+            .join(Project, Package.project_id == Project.id)
+            .filter(
+                or_(
+                    func.lower(Tag.name).contains(search_lower),
+                    func.lower(Artifact.original_name).contains(search_lower)
+                )
+            )
+            .order_by(Tag.name)
+            .limit(limit)
+            .all()
+        )
+
+    def update_metadata(self, artifact: Artifact, metadata: dict) -> Artifact:
+        """Update or merge format metadata."""
+        if artifact.format_metadata:
+            artifact.format_metadata = {**artifact.format_metadata, **metadata}
+        else:
+            artifact.format_metadata = metadata
+        self.db.flush()
+        return artifact
--- a/backend/app/repositories/base.py
+++ b/backend/app/repositories/base.py
@@ -0,0 +1,96 @@
+"""
+Base repository class with common CRUD operations.
+"""
+
+from typing import TypeVar, Generic, Type, Optional, List, Any, Dict
+from sqlalchemy.orm import Session
+from sqlalchemy import func, asc, desc
+from uuid import UUID
+
+from ..models import Base
+
+T = TypeVar("T", bound=Base)
+
+
+class BaseRepository(Generic[T]):
+    """
+    Base repository providing common CRUD operations.
+
+    Subclasses should set `model` class attribute to the SQLAlchemy model.
+    """
+
+    model: Type[T]
+
+    def __init__(self, db: Session):
+        self.db = db
+
+    def get_by_id(self, id: Any) -> Optional[T]:
+        """Get entity by primary key."""
+        return self.db.query(self.model).filter(self.model.id == id).first()
+
+    def get_all(
+        self,
+        skip: int = 0,
+        limit: int = 100,
+        order_by: str = None,
+        order_desc: bool = False,
+    ) -> List[T]:
+        """Get all entities with pagination and optional ordering."""
+        query = self.db.query(self.model)
+
+        if order_by and hasattr(self.model, order_by):
+            column = getattr(self.model, order_by)
+            query = query.order_by(desc(column) if order_desc else asc(column))
+
+        return query.offset(skip).limit(limit).all()
+
+    def count(self) -> int:
+        """Count total entities."""
+        return self.db.query(func.count(self.model.id)).scalar() or 0
+
+    def create(self, **kwargs) -> T:
+        """Create a new entity."""
+        entity = self.model(**kwargs)
+        self.db.add(entity)
+        self.db.flush()  # Flush to get ID without committing
+        return entity
+
+    def update(self, entity: T, **kwargs) -> T:
+        """Update an existing entity."""
+        for key, value in kwargs.items():
+            if hasattr(entity, key):
+                setattr(entity, key, value)
+        self.db.flush()
+        return entity
+
+    def delete(self, entity: T) -> None:
+        """Delete an entity."""
+        self.db.delete(entity)
+        self.db.flush()
+
+    def delete_by_id(self, id: Any) -> bool:
+        """Delete entity by ID. Returns True if deleted, False if not found."""
+        entity = self.get_by_id(id)
+        if entity:
+            self.delete(entity)
+            return True
+        return False
+
+    def exists(self, id: Any) -> bool:
+        """Check if entity exists by ID."""
+        return self.db.query(
+            self.db.query(self.model).filter(self.model.id == id).exists()
+        ).scalar()
+
+    def commit(self) -> None:
+        """Commit the current transaction."""
+        self.db.commit()
+
+    def rollback(self) -> None:
+        """Rollback the current transaction."""
+        self.db.rollback()
+
+    def refresh(self, entity: T) -> T:
+        """Refresh entity from database."""
+        self.db.refresh(entity)
+        return entity
--- a/backend/app/repositories/package.py
+++ b/backend/app/repositories/package.py
@@ -0,0 +1,177 @@
+"""
+Package repository for data access operations.
+"""
+
+from typing import Optional, List, Tuple
+from sqlalchemy.orm import Session
+from sqlalchemy import func, or_, asc, desc
+from uuid import UUID
+
+from .base import BaseRepository
+from ..models import Package, Project, Tag, Upload, Artifact
+
+
+class PackageRepository(BaseRepository[Package]):
+    """Repository for Package entity operations."""
+
+    model = Package
+
+    def get_by_name(self, project_id: UUID, name: str) -> Optional[Package]:
+        """Get package by name within a project."""
+        return (
+            self.db.query(Package)
+            .filter(Package.project_id == project_id, Package.name == name)
+            .first()
+        )
+
+    def get_by_project_and_name(self, project_name: str, package_name: str) -> Optional[Package]:
+        """Get package by project name and package name."""
+        return (
+            self.db.query(Package)
+            .join(Project, Package.project_id == Project.id)
+            .filter(Project.name == project_name, Package.name == package_name)
+            .first()
+        )
+
+    def exists_by_name(self, project_id: UUID, name: str) -> bool:
+        """Check if package with name exists in project."""
+        return self.db.query(
+            self.db.query(Package)
+            .filter(Package.project_id == project_id, Package.name == name)
+            .exists()
+        ).scalar()
+
+    def list_by_project(
+        self,
+        project_id: UUID,
+        page: int = 1,
+        limit: int = 20,
+        search: Optional[str] = None,
+        format: Optional[str] = None,
+        platform: Optional[str] = None,
+        sort: str = "name",
+        order: str = "asc",
+    ) -> Tuple[List[Package], int]:
+        """
+        List packages in a project with filtering and pagination.
+
+        Returns tuple of (packages, total_count).
+        """
+        query = self.db.query(Package).filter(Package.project_id == project_id)
+
+        # Apply search filter
+        if search:
+            search_lower = search.lower()
+            query = query.filter(
+                or_(
+                    func.lower(Package.name).contains(search_lower),
+                    func.lower(Package.description).contains(search_lower)
+                )
+            )
+
+        # Apply format filter
+        if format:
+            query = query.filter(Package.format == format)
+
+        # Apply platform filter
+        if platform:
+            query = query.filter(Package.platform == platform)
+
+        # Get total count
+        total = query.count()
+
+        # Apply sorting
+        sort_columns = {
+            "name": Package.name,
+            "created_at": Package.created_at,
+            "updated_at": Package.updated_at,
+        }
+        sort_column = sort_columns.get(sort, Package.name)
+        if order == "desc":
+            query = query.order_by(desc(sort_column))
+        else:
+            query = query.order_by(asc(sort_column))
+
+        # Apply pagination
+        offset = (page - 1) * limit
+        packages = query.offset(offset).limit(limit).all()
+
+        return packages, total
+
+    def create_package(
+        self,
+        project_id: UUID,
+        name: str,
+        description: Optional[str] = None,
+        format: str = "generic",
+        platform: str = "any",
+    ) -> Package:
+        """Create a new package."""
+        return self.create(
+            project_id=project_id,
+            name=name,
+            description=description,
+            format=format,
+            platform=platform,
+        )
+
+    def update_package(
+        self,
+        package: Package,
+        name: Optional[str] = None,
+        description: Optional[str] = None,
+        format: Optional[str] = None,
+        platform: Optional[str] = None,
+    ) -> Package:
+        """Update package fields."""
+        updates = {}
+        if name is not None:
+            updates["name"] = name
+        if description is not None:
+            updates["description"] = description
+        if format is not None:
+            updates["format"] = format
+        if platform is not None:
+            updates["platform"] = platform
+        return self.update(package, **updates)
+
+    def get_stats(self, package_id: UUID) -> dict:
+        """Get package statistics (tag count, artifact count, total size)."""
+        tag_count = (
+            self.db.query(func.count(Tag.id))
+            .filter(Tag.package_id == package_id)
+            .scalar() or 0
+        )
+
+        artifact_stats = (
+            self.db.query(
+                func.count(func.distinct(Upload.artifact_id)),
+                func.coalesce(func.sum(Artifact.size), 0)
+            )
+            .join(Artifact, Upload.artifact_id == Artifact.id)
+            .filter(Upload.package_id == package_id)
+            .first()
+        )
+
+        return {
+            "tag_count": tag_count,
+            "artifact_count": artifact_stats[0] if artifact_stats else 0,
+            "total_size": artifact_stats[1] if artifact_stats else 0,
+        }
+
+    def search(self, query_str: str, limit: int = 10) -> List[Tuple[Package, str]]:
+        """Search packages by name or description. Returns (package, project_name) tuples."""
+        search_lower = query_str.lower()
+        return (
+            self.db.query(Package, Project.name)
+            .join(Project, Package.project_id == Project.id)
+            .filter(
+                or_(
+                    func.lower(Package.name).contains(search_lower),
+                    func.lower(Package.description).contains(search_lower)
+                )
+            )
+            .order_by(Package.name)
+            .limit(limit)
+            .all()
+        )
--- a/backend/app/repositories/project.py
+++ b/backend/app/repositories/project.py
@@ -0,0 +1,132 @@
+"""
+Project repository for data access operations.
+"""
+
+from typing import Optional, List, Tuple
+from sqlalchemy.orm import Session
+from sqlalchemy import func, or_, asc, desc
+from uuid import UUID
+
+from .base import BaseRepository
+from ..models import Project
+
+
+class ProjectRepository(BaseRepository[Project]):
+    """Repository for Project entity operations."""
+
+    model = Project
+
+    def get_by_name(self, name: str) -> Optional[Project]:
+        """Get project by unique name."""
+        return self.db.query(Project).filter(Project.name == name).first()
+
+    def exists_by_name(self, name: str) -> bool:
+        """Check if project with name exists."""
+        return self.db.query(
+            self.db.query(Project).filter(Project.name == name).exists()
+        ).scalar()
+
+    def list_accessible(
+        self,
+        user_id: str,
+        page: int = 1,
+        limit: int = 20,
+        search: Optional[str] = None,
+        visibility: Optional[str] = None,
+        sort: str = "name",
+        order: str = "asc",
+    ) -> Tuple[List[Project], int]:
+        """
+        List projects accessible to user with filtering and pagination.
+
+        Returns tuple of (projects, total_count).
+        """
+        # Base query - filter by access
+        query = self.db.query(Project).filter(
+            or_(Project.is_public == True, Project.created_by == user_id)
+        )
+
+        # Apply visibility filter
+        if visibility == "public":
+            query = query.filter(Project.is_public == True)
+        elif visibility == "private":
+            query = query.filter(Project.is_public == False, Project.created_by == user_id)
+
+        # Apply search filter
+        if search:
+            search_lower = search.lower()
+            query = query.filter(
+                or_(
+                    func.lower(Project.name).contains(search_lower),
+                    func.lower(Project.description).contains(search_lower)
+                )
+            )
+
+        # Get total count before pagination
+        total = query.count()
+
+        # Apply sorting
+        sort_columns = {
+            "name": Project.name,
+            "created_at": Project.created_at,
+            "updated_at": Project.updated_at,
+        }
+        sort_column = sort_columns.get(sort, Project.name)
+        if order == "desc":
+            query = query.order_by(desc(sort_column))
+        else:
+            query = query.order_by(asc(sort_column))
+
+        # Apply pagination
+        offset = (page - 1) * limit
+        projects = query.offset(offset).limit(limit).all()
+
+        return projects, total
+
+    def create_project(
+        self,
+        name: str,
+        created_by: str,
+        description: Optional[str] = None,
+        is_public: bool = True,
+    ) -> Project:
+        """Create a new project."""
+        return self.create(
+            name=name,
+            description=description,
+            is_public=is_public,
+            created_by=created_by,
+        )
+
+    def update_project(
+        self,
+        project: Project,
+        name: Optional[str] = None,
+        description: Optional[str] = None,
+        is_public: Optional[bool] = None,
+    ) -> Project:
+        """Update project fields."""
+        updates = {}
+        if name is not None:
+            updates["name"] = name
+        if description is not None:
+            updates["description"] = description
+        if is_public is not None:
+            updates["is_public"] = is_public
+        return self.update(project, **updates)
+
+    def search(self, query_str: str, limit: int = 10) -> List[Project]:
+        """Search projects by name or description."""
+        search_lower = query_str.lower()
+        return (
+            self.db.query(Project)
+            .filter(
+                or_(
+                    func.lower(Project.name).contains(search_lower),
+                    func.lower(Project.description).contains(search_lower)
+                )
+            )
+            .order_by(Project.name)
+            .limit(limit)
+            .all()
+        )
--- a/backend/app/repositories/tag.py
+++ b/backend/app/repositories/tag.py
@@ -0,0 +1,168 @@
+"""
+Tag repository for data access operations.
+"""
+
+from typing import Optional, List, Tuple
+from sqlalchemy.orm import Session
+from sqlalchemy import func, or_, asc, desc
+from uuid import UUID
+
+from .base import BaseRepository
+from ..models import Tag, TagHistory, Artifact, Package, Project
+
+
+class TagRepository(BaseRepository[Tag]):
+    """Repository for Tag entity operations."""
+
+    model = Tag
+
+    def get_by_name(self, package_id: UUID, name: str) -> Optional[Tag]:
+        """Get tag by name within a package."""
+        return (
+            self.db.query(Tag)
+            .filter(Tag.package_id == package_id, Tag.name == name)
+            .first()
+        )
+
+    def get_with_artifact(self, package_id: UUID, name: str) -> Optional[Tuple[Tag, Artifact]]:
+        """Get tag with its artifact."""
+        return (
+            self.db.query(Tag, Artifact)
+            .join(Artifact, Tag.artifact_id == Artifact.id)
+            .filter(Tag.package_id == package_id, Tag.name == name)
+            .first()
+        )
+
+    def exists_by_name(self, package_id: UUID, name: str) -> bool:
+        """Check if tag with name exists in package."""
+        return self.db.query(
+            self.db.query(Tag)
+            .filter(Tag.package_id == package_id, Tag.name == name)
+            .exists()
+        ).scalar()
+
+    def list_by_package(
+        self,
+        package_id: UUID,
+        page: int = 1,
+        limit: int = 20,
+        search: Optional[str] = None,
+        sort: str = "name",
+        order: str = "asc",
+    ) -> Tuple[List[Tuple[Tag, Artifact]], int]:
+        """
+        List tags in a package with artifact metadata.
+
+        Returns tuple of ((tag, artifact) tuples, total_count).
+        """
+        query = (
+            self.db.query(Tag, Artifact)
+            .join(Artifact, Tag.artifact_id == Artifact.id)
+            .filter(Tag.package_id == package_id)
+        )
+
+        # Apply search filter (tag name or artifact original filename)
+        if search:
+            search_lower = search.lower()
+            query = query.filter(
+                or_(
+                    func.lower(Tag.name).contains(search_lower),
+                    func.lower(Artifact.original_name).contains(search_lower)
+                )
+            )
+
+        # Get total count
+        total = query.count()
+
+        # Apply sorting
+        sort_columns = {
+            "name": Tag.name,
+            "created_at": Tag.created_at,
+        }
+        sort_column = sort_columns.get(sort, Tag.name)
+        if order == "desc":
+            query = query.order_by(desc(sort_column))
+        else:
+            query = query.order_by(asc(sort_column))
+
+        # Apply pagination
+        offset = (page - 1) * limit
+        results = query.offset(offset).limit(limit).all()
+
+        return results, total
+
+    def create_tag(
+        self,
+        package_id: UUID,
+        name: str,
+        artifact_id: str,
+        created_by: str,
+    ) -> Tag:
+        """Create a new tag."""
+        return self.create(
+            package_id=package_id,
+            name=name,
+            artifact_id=artifact_id,
+            created_by=created_by,
+        )
+
+    def update_artifact(
+        self,
+        tag: Tag,
+        new_artifact_id: str,
+        changed_by: str,
+        record_history: bool = True,
+    ) -> Tag:
+        """
+        Update tag to point to a different artifact.
+        Optionally records change in tag history.
+        """
+        old_artifact_id = tag.artifact_id
+
+        if record_history and old_artifact_id != new_artifact_id:
+            history = TagHistory(
+                tag_id=tag.id,
+                old_artifact_id=old_artifact_id,
+                new_artifact_id=new_artifact_id,
+                changed_by=changed_by,
+            )
+            self.db.add(history)
+
+        tag.artifact_id = new_artifact_id
+        tag.created_by = changed_by
+        self.db.flush()
+        return tag
+
+    def get_history(self, tag_id: UUID) -> List[TagHistory]:
+        """Get tag change history."""
+        return (
+            self.db.query(TagHistory)
+            .filter(TagHistory.tag_id == tag_id)
+            .order_by(TagHistory.changed_at.desc())
+            .all()
+        )
+
+    def get_latest_in_package(self, package_id: UUID) -> Optional[Tag]:
+        """Get the most recently created/updated tag in a package."""
+        return (
+            self.db.query(Tag)
+            .filter(Tag.package_id == package_id)
+            .order_by(Tag.created_at.desc())
+            .first()
+        )
+
+    def get_by_artifact(self, artifact_id: str) -> List[Tag]:
+        """Get all tags pointing to an artifact."""
+        return (
+            self.db.query(Tag)
+            .filter(Tag.artifact_id == artifact_id)
+            .all()
+        )
+
+    def count_by_artifact(self, artifact_id: str) -> int:
+        """Count tags pointing to an artifact."""
+        return (
+            self.db.query(func.count(Tag.id))
+            .filter(Tag.artifact_id == artifact_id)
+            .scalar() or 0
+        )
--- a/backend/app/repositories/upload.py
+++ b/backend/app/repositories/upload.py
@@ -0,0 +1,136 @@
+"""
+Upload repository for data access operations.
+"""
+
+from typing import Optional, List, Tuple
+from datetime import datetime
+from sqlalchemy.orm import Session
+from sqlalchemy import func, desc
+from uuid import UUID
+
+from .base import BaseRepository
+from ..models import Upload, Artifact, Package, Project
+
+
+class UploadRepository(BaseRepository[Upload]):
+    """Repository for Upload entity operations."""
+
+    model = Upload
+
+    def create_upload(
+        self,
+        artifact_id: str,
+        package_id: UUID,
+        uploaded_by: str,
+        original_name: Optional[str] = None,
+        source_ip: Optional[str] = None,
+    ) -> Upload:
+        """Record a new upload event."""
+        return self.create(
+            artifact_id=artifact_id,
+            package_id=package_id,
+            original_name=original_name,
+            uploaded_by=uploaded_by,
+            source_ip=source_ip,
+        )
+
+    def list_by_package(
+        self,
+        package_id: UUID,
+        page: int = 1,
+        limit: int = 20,
+    ) -> Tuple[List[Upload], int]:
+        """List uploads for a package with pagination."""
+        query = self.db.query(Upload).filter(Upload.package_id == package_id)
+
+        total = query.count()
+        offset = (page - 1) * limit
+        uploads = query.order_by(Upload.uploaded_at.desc()).offset(offset).limit(limit).all()
+
+        return uploads, total
+
+    def list_by_artifact(self, artifact_id: str) -> List[Upload]:
+        """List all uploads of a specific artifact."""
+        return (
+            self.db.query(Upload)
+            .filter(Upload.artifact_id == artifact_id)
+            .order_by(Upload.uploaded_at.desc())
+            .all()
+        )
+
+    def get_latest_for_package(self, package_id: UUID) -> Optional[Upload]:
+        """Get the most recent upload for a package."""
+        return (
+            self.db.query(Upload)
+            .filter(Upload.package_id == package_id)
+            .order_by(Upload.uploaded_at.desc())
+            .first()
+        )
+
+    def get_latest_timestamp(self, package_id: UUID) -> Optional[datetime]:
+        """Get timestamp of most recent upload for a package."""
+        result = (
+            self.db.query(func.max(Upload.uploaded_at))
+            .filter(Upload.package_id == package_id)
+            .scalar()
+        )
+        return result
+
+    def count_by_artifact(self, artifact_id: str) -> int:
+        """Count uploads of a specific artifact."""
+        return (
+            self.db.query(func.count(Upload.id))
+            .filter(Upload.artifact_id == artifact_id)
+            .scalar() or 0
+        )
+
+    def count_by_package(self, package_id: UUID) -> int:
+        """Count total uploads for a package."""
+        return (
+            self.db.query(func.count(Upload.id))
+            .filter(Upload.package_id == package_id)
+            .scalar() or 0
+        )
+
+    def get_distinct_artifacts_count(self, package_id: UUID) -> int:
+        """Count distinct artifacts uploaded to a package."""
+        return (
+            self.db.query(func.count(func.distinct(Upload.artifact_id)))
+            .filter(Upload.package_id == package_id)
+            .scalar() or 0
+        )
+
+    def get_uploads_by_user(
+        self,
+        user_id: str,
+        page: int = 1,
+        limit: int = 20,
+    ) -> Tuple[List[Upload], int]:
+        """List uploads by a specific user."""
+        query = self.db.query(Upload).filter(Upload.uploaded_by == user_id)
+
+        total = query.count()
+        offset = (page - 1) * limit
+        uploads = query.order_by(Upload.uploaded_at.desc()).offset(offset).limit(limit).all()
+
+        return uploads, total
+
+    def get_upload_stats(self, package_id: UUID) -> dict:
+        """Get upload statistics for a package."""
+        stats = (
+            self.db.query(
+                func.count(Upload.id),
+                func.count(func.distinct(Upload.artifact_id)),
+                func.min(Upload.uploaded_at),
+                func.max(Upload.uploaded_at),
+            )
+            .filter(Upload.package_id == package_id)
+            .first()
+        )
+
+        return {
+            "total_uploads": stats[0] if stats else 0,
+            "unique_artifacts": stats[1] if stats else 0,
+            "first_upload": stats[2] if stats else None,
+            "last_upload": stats[3] if stats else None,
+        }
--- a/backend/app/routes.py
+++ b/backend/app/routes.py
@@ -1,3 +1,4 @@
+from datetime import datetime
 from fastapi import APIRouter, Depends, HTTPException, UploadFile, File, Form, Request, Query, Header, Response
 from fastapi.responses import StreamingResponse
 from sqlalchemy.orm import Session
@@ -10,13 +11,13 @@ import hashlib

 from .database import get_db
 from .storage import get_storage, S3Storage, MULTIPART_CHUNK_SIZE
-from .models import Project, Package, Artifact, Tag, Upload, Consumer
+from .models import Project, Package, Artifact, Tag, TagHistory, Upload, Consumer
 from .schemas import (
    ProjectCreate, ProjectResponse,
    PackageCreate, PackageResponse, PackageDetailResponse, TagSummary,
    PACKAGE_FORMATS, PACKAGE_PLATFORMS,
-    ArtifactResponse,
-    TagCreate, TagResponse,
+    ArtifactResponse, ArtifactDetailResponse, ArtifactTagInfo, PackageArtifactResponse,
+    TagCreate, TagResponse, TagDetailResponse, TagHistoryResponse,
    UploadResponse,
    ConsumerResponse,
    HealthResponse,
@@ -850,8 +851,17 @@ def download_artifact_compat(


 # Tag routes
-@router.get("/api/v1/project/{project_name}/{package_name}/tags", response_model=List[TagResponse])
-def list_tags(project_name: str, package_name: str, db: Session = Depends(get_db)):
+@router.get("/api/v1/project/{project_name}/{package_name}/tags", response_model=PaginatedResponse[TagDetailResponse])
+def list_tags(
+    project_name: str,
+    package_name: str,
+    page: int = Query(default=1, ge=1, description="Page number"),
+    limit: int = Query(default=20, ge=1, le=100, description="Items per page"),
+    search: Optional[str] = Query(default=None, description="Search by tag name"),
+    sort: str = Query(default="name", description="Sort field (name, created_at)"),
+    order: str = Query(default="asc", description="Sort order (asc, desc)"),
+    db: Session = Depends(get_db),
+):
    project = db.query(Project).filter(Project.name == project_name).first()
    if not project:
        raise HTTPException(status_code=404, detail="Project not found")
@@ -860,8 +870,65 @@ def list_tags(project_name: str, package_name: str, db: Session = Depends(get_db
    if not package:
        raise HTTPException(status_code=404, detail="Package not found")

-    tags = db.query(Tag).filter(Tag.package_id == package.id).order_by(Tag.name).all()
-    return tags
+    # Validate sort field
+    valid_sort_fields = {"name": Tag.name, "created_at": Tag.created_at}
+    if sort not in valid_sort_fields:
+        raise HTTPException(status_code=400, detail=f"Invalid sort field. Must be one of: {', '.join(valid_sort_fields.keys())}")
+
+    # Validate order
+    if order not in ("asc", "desc"):
+        raise HTTPException(status_code=400, detail="Invalid order. Must be 'asc' or 'desc'")
+
+    # Base query with JOIN to artifact for metadata
+    query = db.query(Tag, Artifact).join(Artifact, Tag.artifact_id == Artifact.id).filter(Tag.package_id == package.id)
+
+    # Apply search filter (case-insensitive on tag name)
+    if search:
+        query = query.filter(func.lower(Tag.name).contains(search.lower()))
+
+    # Get total count before pagination
+    total = query.count()
+
+    # Apply sorting
+    sort_column = valid_sort_fields[sort]
+    if order == "desc":
+        query = query.order_by(sort_column.desc())
+    else:
+        query = query.order_by(sort_column.asc())
+
+    # Apply pagination
+    offset = (page - 1) * limit
+    results = query.offset(offset).limit(limit).all()
+
+    # Calculate total pages
+    total_pages = math.ceil(total / limit) if total > 0 else 1
+
+    # Build detailed responses with artifact metadata
+    detailed_tags = []
+    for tag, artifact in results:
+        detailed_tags.append(TagDetailResponse(
+            id=tag.id,
+            package_id=tag.package_id,
+            name=tag.name,
+            artifact_id=tag.artifact_id,
+            created_at=tag.created_at,
+            created_by=tag.created_by,
+            artifact_size=artifact.size,
+            artifact_content_type=artifact.content_type,
+            artifact_original_name=artifact.original_name,
+            artifact_created_at=artifact.created_at,
+            artifact_format_metadata=artifact.format_metadata,
+        ))
+
+    return PaginatedResponse(
+        items=detailed_tags,
+        pagination=PaginationMeta(
+            page=page,
+            limit=limit,
+            total=total,
+            total_pages=total_pages,
+        ),
+    )


@router.post("/api/v1/project/{project_name}/{package_name}/tags", response_model=TagResponse)
@@ -908,6 +975,70 @@ def create_tag(
    return db_tag


+@router.get("/api/v1/project/{project_name}/{package_name}/tags/{tag_name}", response_model=TagDetailResponse)
+def get_tag(
+    project_name: str,
+    package_name: str,
+    tag_name: str,
+    db: Session = Depends(get_db),
+):
+    """Get a single tag with full artifact metadata"""
+    project = db.query(Project).filter(Project.name == project_name).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+
+    package = db.query(Package).filter(Package.project_id == project.id, Package.name == package_name).first()
+    if not package:
+        raise HTTPException(status_code=404, detail="Package not found")
+
+    result = db.query(Tag, Artifact).join(Artifact, Tag.artifact_id == Artifact.id).filter(
+        Tag.package_id == package.id,
+        Tag.name == tag_name
+    ).first()
+
+    if not result:
+        raise HTTPException(status_code=404, detail="Tag not found")
+
+    tag, artifact = result
+    return TagDetailResponse(
+        id=tag.id,
+        package_id=tag.package_id,
+        name=tag.name,
+        artifact_id=tag.artifact_id,
+        created_at=tag.created_at,
+        created_by=tag.created_by,
+        artifact_size=artifact.size,
+        artifact_content_type=artifact.content_type,
+        artifact_original_name=artifact.original_name,
+        artifact_created_at=artifact.created_at,
+        artifact_format_metadata=artifact.format_metadata,
+    )
+
+
+@router.get("/api/v1/project/{project_name}/{package_name}/tags/{tag_name}/history", response_model=List[TagHistoryResponse])
+def get_tag_history(
+    project_name: str,
+    package_name: str,
+    tag_name: str,
+    db: Session = Depends(get_db),
+):
+    """Get the history of artifact assignments for a tag"""
+    project = db.query(Project).filter(Project.name == project_name).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+
+    package = db.query(Package).filter(Package.project_id == project.id, Package.name == package_name).first()
+    if not package:
+        raise HTTPException(status_code=404, detail="Package not found")
+
+    tag = db.query(Tag).filter(Tag.package_id == package.id, Tag.name == tag_name).first()
+    if not tag:
+        raise HTTPException(status_code=404, detail="Tag not found")
+
+    history = db.query(TagHistory).filter(TagHistory.tag_id == tag.id).order_by(TagHistory.changed_at.desc()).all()
+    return history
+
+
 # Consumer routes
@router.get("/api/v1/project/{project_name}/{package_name}/consumers", response_model=List[ConsumerResponse])
 def get_consumers(project_name: str, package_name: str, db: Session = Depends(get_db)):
@@ -923,10 +1054,122 @@ def get_consumers(project_name: str, package_name: str, db: Session = Depends(ge
    return consumers


+# Package artifacts
+@router.get("/api/v1/project/{project_name}/{package_name}/artifacts", response_model=PaginatedResponse[PackageArtifactResponse])
+def list_package_artifacts(
+    project_name: str,
+    package_name: str,
+    page: int = Query(default=1, ge=1, description="Page number"),
+    limit: int = Query(default=20, ge=1, le=100, description="Items per page"),
+    content_type: Optional[str] = Query(default=None, description="Filter by content type"),
+    created_after: Optional[datetime] = Query(default=None, description="Filter artifacts created after this date"),
+    created_before: Optional[datetime] = Query(default=None, description="Filter artifacts created before this date"),
+    db: Session = Depends(get_db),
+):
+    """List all unique artifacts uploaded to a package"""
+    project = db.query(Project).filter(Project.name == project_name).first()
+    if not project:
+        raise HTTPException(status_code=404, detail="Project not found")
+
+    package = db.query(Package).filter(Package.project_id == project.id, Package.name == package_name).first()
+    if not package:
+        raise HTTPException(status_code=404, detail="Package not found")
+
+    # Get distinct artifacts uploaded to this package via uploads table
+    artifact_ids_subquery = db.query(func.distinct(Upload.artifact_id)).filter(
+        Upload.package_id == package.id
+    ).subquery()
+
+    query = db.query(Artifact).filter(Artifact.id.in_(artifact_ids_subquery))
+
+    # Apply content_type filter
+    if content_type:
+        query = query.filter(Artifact.content_type == content_type)
+
+    # Apply date range filters
+    if created_after:
+        query = query.filter(Artifact.created_at >= created_after)
+    if created_before:
+        query = query.filter(Artifact.created_at <= created_before)
+
+    # Get total count before pagination
+    total = query.count()
+
+    # Apply pagination
+    offset = (page - 1) * limit
+    artifacts = query.order_by(Artifact.created_at.desc()).offset(offset).limit(limit).all()
+
+    # Calculate total pages
+    total_pages = math.ceil(total / limit) if total > 0 else 1
+
+    # Build responses with tag info
+    artifact_responses = []
+    for artifact in artifacts:
+        # Get tags pointing to this artifact in this package
+        tags = db.query(Tag.name).filter(
+            Tag.package_id == package.id,
+            Tag.artifact_id == artifact.id
+        ).all()
+        tag_names = [t.name for t in tags]
+
+        artifact_responses.append(PackageArtifactResponse(
+            id=artifact.id,
+            size=artifact.size,
+            content_type=artifact.content_type,
+            original_name=artifact.original_name,
+            created_at=artifact.created_at,
+            created_by=artifact.created_by,
+            format_metadata=artifact.format_metadata,
+            tags=tag_names,
+        ))
+
+    return PaginatedResponse(
+        items=artifact_responses,
+        pagination=PaginationMeta(
+            page=page,
+            limit=limit,
+            total=total,
+            total_pages=total_pages,
+        ),
+    )
+
+
 # Artifact by ID
-@router.get("/api/v1/artifact/{artifact_id}", response_model=ArtifactResponse)
+@router.get("/api/v1/artifact/{artifact_id}", response_model=ArtifactDetailResponse)
 def get_artifact(artifact_id: str, db: Session = Depends(get_db)):
+    """Get artifact metadata including list of packages/tags referencing it"""
    artifact = db.query(Artifact).filter(Artifact.id == artifact_id).first()
    if not artifact:
        raise HTTPException(status_code=404, detail="Artifact not found")
-    return artifact
+
+    # Get all tags referencing this artifact with package and project info
+    tags_with_context = db.query(Tag, Package, Project).join(
+        Package, Tag.package_id == Package.id
+    ).join(
+        Project, Package.project_id == Project.id
+    ).filter(
+        Tag.artifact_id == artifact_id
+    ).all()
+
+    tag_infos = [
+        ArtifactTagInfo(
+            id=tag.id,
+            name=tag.name,
+            package_id=package.id,
+            package_name=package.name,
+            project_name=project.name,
+        )
+        for tag, package, project in tags_with_context
+    ]
+
+    return ArtifactDetailResponse(
+        id=artifact.id,
+        size=artifact.size,
+        content_type=artifact.content_type,
+        original_name=artifact.original_name,
+        created_at=artifact.created_at,
+        created_by=artifact.created_by,
+        ref_count=artifact.ref_count,
+        format_metadata=artifact.format_metadata,
+        tags=tag_infos,
+    )
--- a/backend/app/schemas.py
+++ b/backend/app/schemas.py
@@ -129,6 +129,78 @@ class TagResponse(BaseModel):
        from_attributes = True


+class TagDetailResponse(BaseModel):
+    """Tag with embedded artifact metadata"""
+    id: UUID
+    package_id: UUID
+    name: str
+    artifact_id: str
+    created_at: datetime
+    created_by: str
+    # Artifact metadata
+    artifact_size: int
+    artifact_content_type: Optional[str]
+    artifact_original_name: Optional[str]
+    artifact_created_at: datetime
+    artifact_format_metadata: Optional[Dict[str, Any]] = None
+
+    class Config:
+        from_attributes = True
+
+
+class TagHistoryResponse(BaseModel):
+    """History entry for tag changes"""
+    id: UUID
+    tag_id: UUID
+    old_artifact_id: Optional[str]
+    new_artifact_id: str
+    changed_at: datetime
+    changed_by: str
+
+    class Config:
+        from_attributes = True
+
+
+class ArtifactTagInfo(BaseModel):
+    """Tag info for embedding in artifact responses"""
+    id: UUID
+    name: str
+    package_id: UUID
+    package_name: str
+    project_name: str
+
+
+class ArtifactDetailResponse(BaseModel):
+    """Artifact with list of tags/packages referencing it"""
+    id: str
+    size: int
+    content_type: Optional[str]
+    original_name: Optional[str]
+    created_at: datetime
+    created_by: str
+    ref_count: int
+    format_metadata: Optional[Dict[str, Any]] = None
+    tags: List[ArtifactTagInfo] = []
+
+    class Config:
+        from_attributes = True
+
+
+class PackageArtifactResponse(BaseModel):
+    """Artifact with tags for package artifact listing"""
+    id: str
+    size: int
+    content_type: Optional[str]
+    original_name: Optional[str]
+    created_at: datetime
+    created_by: str
+    format_metadata: Optional[Dict[str, Any]] = None
+    tags: List[str] = []  # Tag names pointing to this artifact
+
+    class Config:
+        from_attributes = True
+
+
 # Upload response
 class UploadResponse(BaseModel):
    artifact_id: str
--- a/backend/app/services/init.py
+++ b/backend/app/services/init.py
@@ -0,0 +1,9 @@
+"""
+Service layer for business logic.
+"""
+
+from .artifact_cleanup import ArtifactCleanupService
+
+__all__ = [
+    "ArtifactCleanupService",
+]
--- a/backend/app/services/artifact_cleanup.py
+++ b/backend/app/services/artifact_cleanup.py
@@ -0,0 +1,181 @@
+"""
+Service for artifact reference counting and cleanup.
+"""
+
+from typing import List, Optional, Tuple
+from sqlalchemy.orm import Session
+import logging
+
+from ..models import Artifact, Tag, Upload, Package
+from ..repositories.artifact import ArtifactRepository
+from ..repositories.tag import TagRepository
+from ..storage import S3Storage
+
+logger = logging.getLogger(__name__)
+
+
+class ArtifactCleanupService:
+    """
+    Service for managing artifact reference counts and cleaning up orphaned artifacts.
+
+    Reference counting rules:
+    - ref_count starts at 1 when artifact is first uploaded
+    - ref_count increments when the same artifact is uploaded again (deduplication)
+    - ref_count decrements when a tag is deleted or updated to point elsewhere
+    - ref_count decrements when a package is deleted (for each tag pointing to artifact)
+    - When ref_count reaches 0, artifact is a candidate for deletion from S3
+    """
+
+    def __init__(self, db: Session, storage: Optional[S3Storage] = None):
+        self.db = db
+        self.storage = storage
+        self.artifact_repo = ArtifactRepository(db)
+        self.tag_repo = TagRepository(db)
+
+    def on_tag_deleted(self, artifact_id: str) -> Artifact:
+        """
+        Called when a tag is deleted.
+        Decrements ref_count for the artifact the tag was pointing to.
+        """
+        artifact = self.artifact_repo.get_by_sha256(artifact_id)
+        if artifact:
+            artifact = self.artifact_repo.decrement_ref_count(artifact)
+            logger.info(f"Decremented ref_count for artifact {artifact_id}: now {artifact.ref_count}")
+        return artifact
+
+    def on_tag_updated(self, old_artifact_id: str, new_artifact_id: str) -> Tuple[Optional[Artifact], Optional[Artifact]]:
+        """
+        Called when a tag is updated to point to a different artifact.
+        Decrements ref_count for old artifact, increments for new (if different).
+
+        Returns (old_artifact, new_artifact) tuple.
+        """
+        old_artifact = None
+        new_artifact = None
+
+        if old_artifact_id != new_artifact_id:
+            # Decrement old artifact ref_count
+            old_artifact = self.artifact_repo.get_by_sha256(old_artifact_id)
+            if old_artifact:
+                old_artifact = self.artifact_repo.decrement_ref_count(old_artifact)
+                logger.info(f"Decremented ref_count for old artifact {old_artifact_id}: now {old_artifact.ref_count}")
+
+            # Increment new artifact ref_count
+            new_artifact = self.artifact_repo.get_by_sha256(new_artifact_id)
+            if new_artifact:
+                new_artifact = self.artifact_repo.increment_ref_count(new_artifact)
+                logger.info(f"Incremented ref_count for new artifact {new_artifact_id}: now {new_artifact.ref_count}")
+
+        return old_artifact, new_artifact
+
+    def on_package_deleted(self, package_id) -> List[str]:
+        """
+        Called when a package is deleted.
+        Decrements ref_count for all artifacts that had tags in the package.
+
+        Returns list of artifact IDs that were affected.
+        """
+        # Get all tags in the package before deletion
+        tags = self.db.query(Tag).filter(Tag.package_id == package_id).all()
+
+        affected_artifacts = []
+        for tag in tags:
+            artifact = self.artifact_repo.get_by_sha256(tag.artifact_id)
+            if artifact:
+                self.artifact_repo.decrement_ref_count(artifact)
+                affected_artifacts.append(tag.artifact_id)
+                logger.info(f"Decremented ref_count for artifact {tag.artifact_id} (package delete)")
+
+        return affected_artifacts
+
+    def cleanup_orphaned_artifacts(self, batch_size: int = 100, dry_run: bool = False) -> List[str]:
+        """
+        Find and delete artifacts with ref_count = 0.
+
+        Args:
+            batch_size: Maximum number of artifacts to process
+            dry_run: If True, only report what would be deleted without actually deleting
+
+        Returns:
+            List of artifact IDs that were (or would be) deleted
+        """
+        orphaned = self.artifact_repo.get_orphaned_artifacts(limit=batch_size)
+
+        deleted_ids = []
+        for artifact in orphaned:
+            if dry_run:
+                logger.info(f"[DRY RUN] Would delete orphaned artifact: {artifact.id}")
+                deleted_ids.append(artifact.id)
+            else:
+                try:
+                    # Delete from S3 first
+                    if self.storage:
+                        self.storage.delete(artifact.s3_key)
+                        logger.info(f"Deleted artifact from S3: {artifact.s3_key}")
+
+                    # Then delete from database
+                    self.artifact_repo.delete(artifact)
+                    deleted_ids.append(artifact.id)
+                    logger.info(f"Deleted orphaned artifact from database: {artifact.id}")
+                except Exception as e:
+                    logger.error(f"Failed to delete artifact {artifact.id}: {e}")
+
+        if not dry_run and deleted_ids:
+            self.db.commit()
+
+        return deleted_ids
+
+    def get_orphaned_count(self) -> int:
+        """Get count of artifacts with ref_count = 0."""
+        from sqlalchemy import func
+        return (
+            self.db.query(func.count(Artifact.id))
+            .filter(Artifact.ref_count == 0)
+            .scalar() or 0
+        )
+
+    def verify_ref_counts(self, fix: bool = False) -> List[dict]:
+        """
+        Verify that ref_counts match actual tag references.
+
+        Args:
+            fix: If True, fix any mismatched ref_counts
+
+        Returns:
+            List of artifacts with mismatched ref_counts
+        """
+        from sqlalchemy import func
+
+        # Get actual tag counts per artifact
+        tag_counts = (
+            self.db.query(Tag.artifact_id, func.count(Tag.id).label("tag_count"))
+            .group_by(Tag.artifact_id)
+            .all()
+        )
+        tag_count_map = {artifact_id: count for artifact_id, count in tag_counts}
+
+        # Check all artifacts
+        artifacts = self.db.query(Artifact).all()
+        mismatches = []
+
+        for artifact in artifacts:
+            actual_count = tag_count_map.get(artifact.id, 0)
+            # ref_count should be at least 1 (initial upload) + additional uploads
+            # But tags are the primary reference, so we check against tag count
+
+            if artifact.ref_count < actual_count:
+                mismatch = {
+                    "artifact_id": artifact.id,
+                    "stored_ref_count": artifact.ref_count,
+                    "actual_tag_count": actual_count,
+                }
+                mismatches.append(mismatch)
+
+                if fix:
+                    artifact.ref_count = max(actual_count, 1)
+                    logger.warning(f"Fixed ref_count for artifact {artifact.id}: {mismatch['stored_ref_count']} -> {artifact.ref_count}")
+
+        if fix and mismatches:
+            self.db.commit()
+
+        return mismatches
--- a/frontend/src/api.ts
+++ b/frontend/src/api.ts
@@ -1,4 +1,17 @@
-import { Project, Package, Tag, Artifact, UploadResponse } from './types';
+import {
+  Project,
+  Package,
+  Tag,
+  TagDetail,
+  Artifact,
+  ArtifactDetail,
+  UploadResponse,
+  PaginatedResponse,
+  ListParams,
+  TagListParams,
+  PackageListParams,
+  ArtifactListParams,
+} from './types';

 const API_BASE = '/api/v1';

@@ -10,21 +23,26 @@ async function handleResponse<T>(response: Response): Promise<T> {
  return response.json();
 }

-// Paginated response type
-interface PaginatedResponse<T> {
-  items: T[];
-  pagination: {
-    page: number;
-    limit: number;
-    total: number;
-    total_pages: number;
-  };
+function buildQueryString(params: Record<string, unknown>): string {
+  const searchParams = new URLSearchParams();
+  Object.entries(params).forEach(([key, value]) => {
+    if (value !== undefined && value !== null && value !== '') {
+      searchParams.append(key, String(value));
+    }
+  });
+  const query = searchParams.toString();
+  return query ? `?${query}` : '';
 }

 // Project API
-export async function listProjects(): Promise<Project[]> {
-  const response = await fetch(`${API_BASE}/projects`);
-  const data = await handleResponse<PaginatedResponse<Project>>(response);
+export async function listProjects(params: ListParams = {}): Promise<PaginatedResponse<Project>> {
+  const query = buildQueryString(params as Record<string, unknown>);
+  const response = await fetch(`${API_BASE}/projects${query}`);
+  return handleResponse<PaginatedResponse<Project>>(response);
+}
+
+export async function listProjectsSimple(params: ListParams = {}): Promise<Project[]> {
+  const data = await listProjects(params);
  return data.items;
 }

@@ -43,12 +61,22 @@ export async function getProject(name: string): Promise<Project> {
 }

 // Package API
-export async function listPackages(projectName: string): Promise<Package[]> {
-  const response = await fetch(`${API_BASE}/project/${projectName}/packages`);
-  const data = await handleResponse<PaginatedResponse<Package>>(response);
+export async function listPackages(projectName: string, params: PackageListParams = {}): Promise<PaginatedResponse<Package>> {
+  const query = buildQueryString(params as Record<string, unknown>);
+  const response = await fetch(`${API_BASE}/project/${projectName}/packages${query}`);
+  return handleResponse<PaginatedResponse<Package>>(response);
+}
+
+export async function listPackagesSimple(projectName: string, params: PackageListParams = {}): Promise<Package[]> {
+  const data = await listPackages(projectName, params);
  return data.items;
 }

+export async function getPackage(projectName: string, packageName: string): Promise<Package> {
+  const response = await fetch(`${API_BASE}/project/${projectName}/packages/${packageName}`);
+  return handleResponse<Package>(response);
+}
+
 export async function createPackage(projectName: string, data: { name: string; description?: string }): Promise<Package> {
  const response = await fetch(`${API_BASE}/project/${projectName}/packages`, {
    method: 'POST',
@@ -59,9 +87,20 @@ export async function createPackage(projectName: string, data: { name: string; d
 }

 // Tag API
-export async function listTags(projectName: string, packageName: string): Promise<Tag[]> {
-  const response = await fetch(`${API_BASE}/project/${projectName}/${packageName}/tags`);
-  return handleResponse<Tag[]>(response);
+export async function listTags(projectName: string, packageName: string, params: TagListParams = {}): Promise<PaginatedResponse<TagDetail>> {
+  const query = buildQueryString(params as Record<string, unknown>);
+  const response = await fetch(`${API_BASE}/project/${projectName}/${packageName}/tags${query}`);
+  return handleResponse<PaginatedResponse<TagDetail>>(response);
+}
+
+export async function listTagsSimple(projectName: string, packageName: string, params: TagListParams = {}): Promise<TagDetail[]> {
+  const data = await listTags(projectName, packageName, params);
+  return data.items;
+}
+
+export async function getTag(projectName: string, packageName: string, tagName: string): Promise<TagDetail> {
+  const response = await fetch(`${API_BASE}/project/${projectName}/${packageName}/tags/${tagName}`);
+  return handleResponse<TagDetail>(response);
 }

 export async function createTag(projectName: string, packageName: string, data: { name: string; artifact_id: string }): Promise<Tag> {
@@ -74,9 +113,19 @@ export async function createTag(projectName: string, packageName: string, data:
 }

 // Artifact API
-export async function getArtifact(artifactId: string): Promise<Artifact> {
+export async function getArtifact(artifactId: string): Promise<ArtifactDetail> {
  const response = await fetch(`${API_BASE}/artifact/${artifactId}`);
-  return handleResponse<Artifact>(response);
+  return handleResponse<ArtifactDetail>(response);
+}
+
+export async function listPackageArtifacts(
+  projectName: string,
+  packageName: string,
+  params: ArtifactListParams = {}
+): Promise<PaginatedResponse<Artifact & { tags: string[] }>> {
+  const query = buildQueryString(params as Record<string, unknown>);
+  const response = await fetch(`${API_BASE}/project/${projectName}/${packageName}/artifacts${query}`);
+  return handleResponse<PaginatedResponse<Artifact & { tags: string[] }>>(response);
 }

 // Upload
--- a/frontend/src/components/Badge.css
+++ b/frontend/src/components/Badge.css
@@ -0,0 +1,43 @@
+/* Badge Component */
+.badge {
+  display: inline-flex;
+  align-items: center;
+  padding: 4px 10px;
+  border-radius: 100px;
+  font-weight: 500;
+  font-size: 0.75rem;
+  text-transform: uppercase;
+  letter-spacing: 0.02em;
+}
+
+.badge--default {
+  background: var(--bg-tertiary);
+  color: var(--text-secondary);
+  border: 1px solid var(--border-primary);
+}
+
+.badge--success,
+.badge--public {
+  background: var(--success-bg);
+  color: var(--success);
+  border: 1px solid rgba(34, 197, 94, 0.2);
+}
+
+.badge--warning,
+.badge--private {
+  background: var(--warning-bg);
+  color: var(--warning);
+  border: 1px solid rgba(245, 158, 11, 0.2);
+}
+
+.badge--error {
+  background: var(--error-bg);
+  color: var(--error);
+  border: 1px solid rgba(239, 68, 68, 0.2);
+}
+
+.badge--info {
+  background: rgba(59, 130, 246, 0.1);
+  color: #3b82f6;
+  border: 1px solid rgba(59, 130, 246, 0.2);
+}
--- a/frontend/src/components/Badge.tsx
+++ b/frontend/src/components/Badge.tsx
@@ -0,0 +1,17 @@
+import './Badge.css';
+
+type BadgeVariant = 'default' | 'success' | 'warning' | 'error' | 'info' | 'public' | 'private';
+
+interface BadgeProps {
+  children: React.ReactNode;
+  variant?: BadgeVariant;
+  className?: string;
+}
+
+export function Badge({ children, variant = 'default', className = '' }: BadgeProps) {
+  return (
+    <span className={`badge badge--${variant} ${className}`.trim()}>
+      {children}
+    </span>
+  );
+}
--- a/frontend/src/components/Breadcrumb.css
+++ b/frontend/src/components/Breadcrumb.css
@@ -0,0 +1,38 @@
+/* Breadcrumb Component */
+.breadcrumb {
+  margin-bottom: 24px;
+}
+
+.breadcrumb__list {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  list-style: none;
+  padding: 0;
+  margin: 0;
+  font-size: 0.875rem;
+}
+
+.breadcrumb__item {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+.breadcrumb__link {
+  color: var(--text-secondary);
+  transition: color var(--transition-fast);
+}
+
+.breadcrumb__link:hover {
+  color: var(--accent-primary);
+}
+
+.breadcrumb__separator {
+  color: var(--text-muted);
+}
+
+.breadcrumb__current {
+  color: var(--text-primary);
+  font-weight: 500;
+}
--- a/frontend/src/components/Breadcrumb.tsx
+++ b/frontend/src/components/Breadcrumb.tsx
@@ -0,0 +1,38 @@
+import { Link } from 'react-router-dom';
+import './Breadcrumb.css';
+
+interface BreadcrumbItem {
+  label: string;
+  href?: string;
+}
+
+interface BreadcrumbProps {
+  items: BreadcrumbItem[];
+  className?: string;
+}
+
+export function Breadcrumb({ items, className = '' }: BreadcrumbProps) {
+  return (
+    <nav className={`breadcrumb ${className}`.trim()} aria-label="Breadcrumb">
+      <ol className="breadcrumb__list">
+        {items.map((item, index) => {
+          const isLast = index === items.length - 1;
+          return (
+            <li key={index} className="breadcrumb__item">
+              {!isLast && item.href ? (
+                <>
+                  <Link to={item.href} className="breadcrumb__link">
+                    {item.label}
+                  </Link>
+                  <span className="breadcrumb__separator">/</span>
+                </>
+              ) : (
+                <span className="breadcrumb__current">{item.label}</span>
+              )}
+            </li>
+          );
+        })}
+      </ol>
+    </nav>
+  );
+}
--- a/frontend/src/components/Card.css
+++ b/frontend/src/components/Card.css
@@ -0,0 +1,78 @@
+/* Card Component */
+.card {
+  background: var(--bg-secondary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-lg);
+  padding: 24px;
+  transition: all var(--transition-normal);
+}
+
+.card--elevated {
+  box-shadow: var(--shadow-md);
+}
+
+.card--accent {
+  background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(5, 150, 105, 0.05) 100%);
+  border: 1px solid rgba(16, 185, 129, 0.2);
+}
+
+.card--clickable {
+  display: block;
+  color: inherit;
+  position: relative;
+  overflow: hidden;
+  cursor: pointer;
+}
+
+.card--clickable::before {
+  content: '';
+  position: absolute;
+  inset: 0;
+  background: var(--accent-gradient);
+  opacity: 0;
+  transition: opacity var(--transition-normal);
+  border-radius: var(--radius-lg);
+}
+
+.card--clickable:hover {
+  border-color: var(--border-secondary);
+  transform: translateY(-2px);
+  box-shadow: var(--shadow-lg);
+  color: inherit;
+}
+
+.card--clickable:hover::before {
+  opacity: 0.03;
+}
+
+.card__header {
+  margin-bottom: 16px;
+}
+
+.card__header h3 {
+  color: var(--text-primary);
+  font-size: 1.125rem;
+  font-weight: 600;
+  margin-bottom: 4px;
+}
+
+.card__header p {
+  color: var(--text-secondary);
+  font-size: 0.875rem;
+  line-height: 1.5;
+}
+
+.card__body {
+  color: var(--text-secondary);
+  font-size: 0.875rem;
+}
+
+.card__footer {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  font-size: 0.75rem;
+  padding-top: 16px;
+  border-top: 1px solid var(--border-primary);
+  margin-top: 16px;
+}
--- a/frontend/src/components/Card.tsx
+++ b/frontend/src/components/Card.tsx
@@ -0,0 +1,59 @@
+import { ReactNode } from 'react';
+import './Card.css';
+
+interface CardProps {
+  children: ReactNode;
+  className?: string;
+  onClick?: () => void;
+  href?: string;
+  variant?: 'default' | 'elevated' | 'accent';
+}
+
+export function Card({ children, className = '', onClick, href, variant = 'default' }: CardProps) {
+  const baseClass = `card card--${variant} ${className}`.trim();
+
+  if (href) {
+    return (
+      <a href={href} className={`${baseClass} card--clickable`}>
+        {children}
+      </a>
+    );
+  }
+
+  if (onClick) {
+    return (
+      <div className={`${baseClass} card--clickable`} onClick={onClick} role="button" tabIndex={0}>
+        {children}
+      </div>
+    );
+  }
+
+  return <div className={baseClass}>{children}</div>;
+}
+
+interface CardHeaderProps {
+  children: ReactNode;
+  className?: string;
+}
+
+export function CardHeader({ children, className = '' }: CardHeaderProps) {
+  return <div className={`card__header ${className}`.trim()}>{children}</div>;
+}
+
+interface CardBodyProps {
+  children: ReactNode;
+  className?: string;
+}
+
+export function CardBody({ children, className = '' }: CardBodyProps) {
+  return <div className={`card__body ${className}`.trim()}>{children}</div>;
+}
+
+interface CardFooterProps {
+  children: ReactNode;
+  className?: string;
+}
+
+export function CardFooter({ children, className = '' }: CardFooterProps) {
+  return <div className={`card__footer ${className}`.trim()}>{children}</div>;
+}
--- a/frontend/src/components/DataTable.css
+++ b/frontend/src/components/DataTable.css
@@ -0,0 +1,100 @@
+/* DataTable Component */
+.data-table {
+  background: var(--bg-secondary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-lg);
+  overflow: hidden;
+}
+
+.data-table table {
+  width: 100%;
+  border-collapse: collapse;
+}
+
+.data-table th,
+.data-table td {
+  padding: 14px 20px;
+  text-align: left;
+  border-bottom: 1px solid var(--border-primary);
+}
+
+.data-table th {
+  background: var(--bg-tertiary);
+  font-weight: 600;
+  font-size: 0.75rem;
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+  color: var(--text-tertiary);
+}
+
+.data-table__th--sortable {
+  cursor: pointer;
+  user-select: none;
+  transition: color var(--transition-fast);
+}
+
+.data-table__th--sortable:hover {
+  color: var(--text-primary);
+}
+
+.data-table__th-content {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+}
+
+.data-table__sort-icon {
+  transition: transform var(--transition-fast);
+}
+
+.data-table__sort-icon--desc {
+  transform: rotate(180deg);
+}
+
+.data-table tbody tr:last-child td {
+  border-bottom: none;
+}
+
+.data-table tbody tr {
+  transition: background var(--transition-fast);
+}
+
+.data-table tbody tr:hover {
+  background: var(--bg-tertiary);
+}
+
+.data-table td strong {
+  color: var(--accent-primary);
+  font-weight: 600;
+}
+
+/* Empty state */
+.data-table__empty {
+  text-align: center;
+  padding: 48px 32px;
+  color: var(--text-tertiary);
+  background: var(--bg-secondary);
+  border: 1px dashed var(--border-secondary);
+  border-radius: var(--radius-lg);
+}
+
+.data-table__empty p {
+  font-size: 0.9375rem;
+}
+
+/* Utility classes for cells */
+.data-table .cell-mono {
+  font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
+  font-size: 0.8125rem;
+  color: var(--text-tertiary);
+  background: var(--bg-tertiary);
+  padding: 4px 8px;
+  border-radius: var(--radius-sm);
+}
+
+.data-table .cell-truncate {
+  max-width: 200px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
--- a/frontend/src/components/DataTable.tsx
+++ b/frontend/src/components/DataTable.tsx
@@ -0,0 +1,86 @@
+import { ReactNode } from 'react';
+import './DataTable.css';
+
+interface Column<T> {
+  key: string;
+  header: string;
+  render: (item: T) => ReactNode;
+  className?: string;
+  sortable?: boolean;
+}
+
+interface DataTableProps<T> {
+  data: T[];
+  columns: Column<T>[];
+  keyExtractor: (item: T) => string;
+  emptyMessage?: string;
+  className?: string;
+  onSort?: (key: string) => void;
+  sortKey?: string;
+  sortOrder?: 'asc' | 'desc';
+}
+
+export function DataTable<T>({
+  data,
+  columns,
+  keyExtractor,
+  emptyMessage = 'No data available',
+  className = '',
+  onSort,
+  sortKey,
+  sortOrder,
+}: DataTableProps<T>) {
+  if (data.length === 0) {
+    return (
+      <div className="data-table__empty">
+        <p>{emptyMessage}</p>
+      </div>
+    );
+  }
+
+  return (
+    <div className={`data-table ${className}`.trim()}>
+      <table>
+        <thead>
+          <tr>
+            {columns.map((column) => (
+              <th
+                key={column.key}
+                className={`${column.className || ''} ${column.sortable ? 'data-table__th--sortable' : ''}`}
+                onClick={() => column.sortable && onSort?.(column.key)}
+              >
+                <span className="data-table__th-content">
+                  {column.header}
+                  {column.sortable && sortKey === column.key && (
+                    <svg
+                      className={`data-table__sort-icon ${sortOrder === 'desc' ? 'data-table__sort-icon--desc' : ''}`}
+                      width="12"
+                      height="12"
+                      viewBox="0 0 24 24"
+                      fill="none"
+                      stroke="currentColor"
+                      strokeWidth="2"
+                    >
+                      <polyline points="18 15 12 9 6 15" />
+                    </svg>
+                  )}
+                </span>
+              </th>
+            ))}
+          </tr>
+        </thead>
+        <tbody>
+          {data.map((item) => (
+            <tr key={keyExtractor(item)}>
+              {columns.map((column) => (
+                <td key={column.key} className={column.className}>
+                  {column.render(item)}
+                </td>
+              ))}
+            </tr>
+          ))}
+        </tbody>
+      </table>
+    </div>
+  );
+}
--- a/frontend/src/components/FilterChip.css
+++ b/frontend/src/components/FilterChip.css
@@ -0,0 +1,63 @@
+/* FilterChip Component */
+.filter-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  padding: 4px 8px 4px 10px;
+  background: var(--bg-tertiary);
+  border: 1px solid var(--border-primary);
+  border-radius: 100px;
+  font-size: 0.75rem;
+}
+
+.filter-chip__label {
+  color: var(--text-muted);
+}
+
+.filter-chip__value {
+  color: var(--text-primary);
+  font-weight: 500;
+}
+
+.filter-chip__remove {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 18px;
+  height: 18px;
+  padding: 0;
+  background: transparent;
+  border: none;
+  border-radius: 50%;
+  color: var(--text-muted);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+}
+
+.filter-chip__remove:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+/* FilterChipGroup */
+.filter-chip-group {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 16px;
+}
+
+.filter-chip-group__clear {
+  padding: 4px 10px;
+  background: transparent;
+  border: none;
+  font-size: 0.75rem;
+  color: var(--text-muted);
+  cursor: pointer;
+  transition: color var(--transition-fast);
+}
+
+.filter-chip-group__clear:hover {
+  color: var(--error);
+}
--- a/frontend/src/components/FilterChip.tsx
+++ b/frontend/src/components/FilterChip.tsx
@@ -0,0 +1,47 @@
+import './FilterChip.css';
+
+interface FilterChipProps {
+  label: string;
+  value: string;
+  onRemove: () => void;
+  className?: string;
+}
+
+export function FilterChip({ label, value, onRemove, className = '' }: FilterChipProps) {
+  return (
+    <span className={`filter-chip ${className}`.trim()}>
+      <span className="filter-chip__label">{label}:</span>
+      <span className="filter-chip__value">{value}</span>
+      <button
+        type="button"
+        className="filter-chip__remove"
+        onClick={onRemove}
+        aria-label={`Remove ${label} filter`}
+      >
+        <svg width="12" height="12" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+          <line x1="18" y1="6" x2="6" y2="18" />
+          <line x1="6" y1="6" x2="18" y2="18" />
+        </svg>
+      </button>
+    </span>
+  );
+}
+
+interface FilterChipGroupProps {
+  children: React.ReactNode;
+  onClearAll?: () => void;
+  className?: string;
+}
+
+export function FilterChipGroup({ children, onClearAll, className = '' }: FilterChipGroupProps) {
+  return (
+    <div className={`filter-chip-group ${className}`.trim()}>
+      {children}
+      {onClearAll && (
+        <button type="button" className="filter-chip-group__clear" onClick={onClearAll}>
+          Clear all
+        </button>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/components/Pagination.css
+++ b/frontend/src/components/Pagination.css
@@ -0,0 +1,64 @@
+/* Pagination Component */
+.pagination {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  padding: 16px 0;
+  margin-top: 16px;
+}
+
+.pagination__info {
+  font-size: 0.8125rem;
+  color: var(--text-muted);
+}
+
+.pagination__controls {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+.pagination__btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  min-width: 32px;
+  height: 32px;
+  padding: 0 8px;
+  background: var(--bg-tertiary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-md);
+  font-size: 0.8125rem;
+  color: var(--text-secondary);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+}
+
+.pagination__btn:hover:not(:disabled) {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+  border-color: var(--border-secondary);
+}
+
+.pagination__btn:disabled {
+  opacity: 0.4;
+  cursor: not-allowed;
+}
+
+.pagination__page--active {
+  background: var(--accent-primary);
+  border-color: var(--accent-primary);
+  color: white;
+}
+
+.pagination__page--active:hover {
+  background: var(--accent-primary);
+  border-color: var(--accent-primary);
+  color: white;
+}
+
+.pagination__ellipsis {
+  padding: 0 8px;
+  color: var(--text-muted);
+  font-size: 0.8125rem;
+}
--- a/frontend/src/components/Pagination.tsx
+++ b/frontend/src/components/Pagination.tsx
@@ -0,0 +1,98 @@
+import './Pagination.css';
+
+interface PaginationProps {
+  page: number;
+  totalPages: number;
+  total: number;
+  limit: number;
+  onPageChange: (page: number) => void;
+  className?: string;
+}
+
+export function Pagination({ page, totalPages, total, limit, onPageChange, className = '' }: PaginationProps) {
+  const start = (page - 1) * limit + 1;
+  const end = Math.min(page * limit, total);
+
+  if (totalPages <= 1) {
+    return null;
+  }
+
+  const getPageNumbers = (): (number | 'ellipsis')[] => {
+    const pages: (number | 'ellipsis')[] = [];
+    const showEllipsisStart = page > 3;
+    const showEllipsisEnd = page < totalPages - 2;
+
+    pages.push(1);
+
+    if (showEllipsisStart) {
+      pages.push('ellipsis');
+    }
+
+    for (let i = Math.max(2, page - 1); i <= Math.min(totalPages - 1, page + 1); i++) {
+      if (!pages.includes(i)) {
+        pages.push(i);
+      }
+    }
+
+    if (showEllipsisEnd) {
+      pages.push('ellipsis');
+    }
+
+    if (totalPages > 1 && !pages.includes(totalPages)) {
+      pages.push(totalPages);
+    }
+
+    return pages;
+  };
+
+  return (
+    <div className={`pagination ${className}`.trim()}>
+      <span className="pagination__info">
+        Showing {start}-{end} of {total}
+      </span>
+
+      <div className="pagination__controls">
+        <button
+          type="button"
+          className="pagination__btn"
+          onClick={() => onPageChange(page - 1)}
+          disabled={page <= 1}
+          aria-label="Previous page"
+        >
+          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+            <polyline points="15 18 9 12 15 6" />
+          </svg>
+        </button>
+
+        {getPageNumbers().map((pageNum, index) =>
+          pageNum === 'ellipsis' ? (
+            <span key={`ellipsis-${index}`} className="pagination__ellipsis">
+              ...
+            </span>
+          ) : (
+            <button
+              key={pageNum}
+              type="button"
+              className={`pagination__btn pagination__page ${pageNum === page ? 'pagination__page--active' : ''}`}
+              onClick={() => onPageChange(pageNum)}
+            >
+              {pageNum}
+            </button>
+          )
+        )}
+
+        <button
+          type="button"
+          className="pagination__btn"
+          onClick={() => onPageChange(page + 1)}
+          disabled={page >= totalPages}
+          aria-label="Next page"
+        >
+          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+            <polyline points="9 18 15 12 9 6" />
+          </svg>
+        </button>
+      </div>
+    </div>
+  );
+}
--- a/frontend/src/components/SearchInput.css
+++ b/frontend/src/components/SearchInput.css
@@ -0,0 +1,57 @@
+/* SearchInput Component */
+.search-input {
+  position: relative;
+  display: flex;
+  align-items: center;
+}
+
+.search-input__icon {
+  position: absolute;
+  left: 12px;
+  color: var(--text-muted);
+  pointer-events: none;
+}
+
+.search-input__field {
+  width: 100%;
+  padding: 10px 36px 10px 40px;
+  background: var(--bg-tertiary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-md);
+  font-size: 0.875rem;
+  color: var(--text-primary);
+  transition: all var(--transition-fast);
+}
+
+.search-input__field::placeholder {
+  color: var(--text-muted);
+}
+
+.search-input__field:focus {
+  outline: none;
+  border-color: var(--accent-primary);
+  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
+  background: var(--bg-elevated);
+}
+
+.search-input__clear {
+  position: absolute;
+  right: 8px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 24px;
+  height: 24px;
+  padding: 0;
+  background: transparent;
+  border: none;
+  border-radius: var(--radius-sm);
+  color: var(--text-muted);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+}
+
+.search-input__clear:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
--- a/frontend/src/components/SearchInput.tsx
+++ b/frontend/src/components/SearchInput.tsx
@@ -0,0 +1,74 @@
+import { useState, useEffect } from 'react';
+import './SearchInput.css';
+
+interface SearchInputProps {
+  value: string;
+  onChange: (value: string) => void;
+  placeholder?: string;
+  debounceMs?: number;
+  className?: string;
+}
+
+export function SearchInput({
+  value,
+  onChange,
+  placeholder = 'Search...',
+  debounceMs = 300,
+  className = '',
+}: SearchInputProps) {
+  const [localValue, setLocalValue] = useState(value);
+
+  useEffect(() => {
+    setLocalValue(value);
+  }, [value]);
+
+  useEffect(() => {
+    const timer = setTimeout(() => {
+      if (localValue !== value) {
+        onChange(localValue);
+      }
+    }, debounceMs);
+
+    return () => clearTimeout(timer);
+  }, [localValue, debounceMs, onChange, value]);
+
+  return (
+    <div className={`search-input ${className}`.trim()}>
+      <svg
+        className="search-input__icon"
+        width="16"
+        height="16"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        strokeWidth="2"
+      >
+        <circle cx="11" cy="11" r="8" />
+        <line x1="21" y1="21" x2="16.65" y2="16.65" />
+      </svg>
+      <input
+        type="text"
+        value={localValue}
+        onChange={(e) => setLocalValue(e.target.value)}
+        placeholder={placeholder}
+        className="search-input__field"
+      />
+      {localValue && (
+        <button
+          type="button"
+          className="search-input__clear"
+          onClick={() => {
+            setLocalValue('');
+            onChange('');
+          }}
+          aria-label="Clear search"
+        >
+          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+            <line x1="18" y1="6" x2="6" y2="18" />
+            <line x1="6" y1="6" x2="18" y2="18" />
+          </svg>
+        </button>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/components/SortDropdown.css
+++ b/frontend/src/components/SortDropdown.css
@@ -0,0 +1,95 @@
+/* SortDropdown Component */
+.sort-dropdown {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+  position: relative;
+}
+
+.sort-dropdown__trigger {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  padding: 8px 12px;
+  background: var(--bg-tertiary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-md);
+  font-size: 0.8125rem;
+  color: var(--text-secondary);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+}
+
+.sort-dropdown__trigger:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+  border-color: var(--border-secondary);
+}
+
+.sort-dropdown__chevron {
+  transition: transform var(--transition-fast);
+}
+
+.sort-dropdown__chevron--open {
+  transform: rotate(180deg);
+}
+
+.sort-dropdown__order {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 32px;
+  height: 32px;
+  padding: 0;
+  background: var(--bg-tertiary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-md);
+  color: var(--text-secondary);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+}
+
+.sort-dropdown__order:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+  border-color: var(--border-secondary);
+}
+
+.sort-dropdown__menu {
+  position: absolute;
+  top: 100%;
+  left: 0;
+  margin-top: 4px;
+  min-width: 180px;
+  background: var(--bg-secondary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-md);
+  box-shadow: var(--shadow-lg);
+  z-index: 100;
+  overflow: hidden;
+}
+
+.sort-dropdown__option {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  width: 100%;
+  padding: 10px 14px;
+  background: transparent;
+  border: none;
+  font-size: 0.8125rem;
+  color: var(--text-secondary);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+  text-align: left;
+}
+
+.sort-dropdown__option:hover {
+  background: var(--bg-hover);
+  color: var(--text-primary);
+}
+
+.sort-dropdown__option--selected {
+  color: var(--accent-primary);
+  font-weight: 500;
+}
--- a/frontend/src/components/SortDropdown.tsx
+++ b/frontend/src/components/SortDropdown.tsx
@@ -0,0 +1,108 @@
+import { useState, useRef, useEffect } from 'react';
+import './SortDropdown.css';
+
+export interface SortOption {
+  value: string;
+  label: string;
+}
+
+interface SortDropdownProps {
+  options: SortOption[];
+  value: string;
+  order: 'asc' | 'desc';
+  onChange: (value: string, order: 'asc' | 'desc') => void;
+  className?: string;
+}
+
+export function SortDropdown({ options, value, order, onChange, className = '' }: SortDropdownProps) {
+  const [isOpen, setIsOpen] = useState(false);
+  const dropdownRef = useRef<HTMLDivElement>(null);
+
+  const selectedOption = options.find((o) => o.value === value) || options[0];
+
+  useEffect(() => {
+    function handleClickOutside(event: MouseEvent) {
+      if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
+        setIsOpen(false);
+      }
+    }
+
+    document.addEventListener('mousedown', handleClickOutside);
+    return () => document.removeEventListener('mousedown', handleClickOutside);
+  }, []);
+
+  const toggleOrder = () => {
+    onChange(value, order === 'asc' ? 'desc' : 'asc');
+  };
+
+  return (
+    <div className={`sort-dropdown ${className}`.trim()} ref={dropdownRef}>
+      <button
+        type="button"
+        className="sort-dropdown__trigger"
+        onClick={() => setIsOpen(!isOpen)}
+        aria-expanded={isOpen}
+      >
+        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+          <line x1="4" y1="6" x2="20" y2="6" />
+          <line x1="4" y1="12" x2="14" y2="12" />
+          <line x1="4" y1="18" x2="8" y2="18" />
+        </svg>
+        <span>Sort: {selectedOption.label}</span>
+        <svg
+          className={`sort-dropdown__chevron ${isOpen ? 'sort-dropdown__chevron--open' : ''}`}
+          width="14"
+          height="14"
+          viewBox="0 0 24 24"
+          fill="none"
+          stroke="currentColor"
+          strokeWidth="2"
+        >
+          <polyline points="6 9 12 15 18 9" />
+        </svg>
+      </button>
+
+      <button
+        type="button"
+        className="sort-dropdown__order"
+        onClick={toggleOrder}
+        title={order === 'asc' ? 'Ascending' : 'Descending'}
+      >
+        {order === 'asc' ? (
+          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+            <line x1="12" y1="19" x2="12" y2="5" />
+            <polyline points="5 12 12 5 19 12" />
+          </svg>
+        ) : (
+          <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+            <line x1="12" y1="5" x2="12" y2="19" />
+            <polyline points="19 12 12 19 5 12" />
+          </svg>
+        )}
+      </button>
+
+      {isOpen && (
+        <div className="sort-dropdown__menu">
+          {options.map((option) => (
+            <button
+              key={option.value}
+              type="button"
+              className={`sort-dropdown__option ${option.value === value ? 'sort-dropdown__option--selected' : ''}`}
+              onClick={() => {
+                onChange(option.value, order);
+                setIsOpen(false);
+              }}
+            >
+              {option.label}
+              {option.value === value && (
+                <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+                  <polyline points="20 6 9 17 4 12" />
+                </svg>
+              )}
+            </button>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}
--- a/frontend/src/components/index.ts
+++ b/frontend/src/components/index.ts
@@ -0,0 +1,9 @@
+export { Card, CardHeader, CardBody, CardFooter } from './Card';
+export { Badge } from './Badge';
+export { Breadcrumb } from './Breadcrumb';
+export { SearchInput } from './SearchInput';
+export { SortDropdown } from './SortDropdown';
+export type { SortOption } from './SortDropdown';
+export { FilterChip, FilterChipGroup } from './FilterChip';
+export { DataTable } from './DataTable';
+export { Pagination } from './Pagination';
--- a/frontend/src/pages/Home.css
+++ b/frontend/src/pages/Home.css
@@ -272,6 +272,179 @@
  color: var(--text-muted);
 }

+.owner {
+  color: var(--text-muted);
+  font-size: 0.75rem;
+}
+
+.project-meta__dates {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+  text-align: right;
+}
+
+.project-meta__owner {
+  margin-top: 8px;
+  padding-top: 8px;
+  border-top: 1px solid var(--border-primary);
+}
+
+/* List Controls */
+.list-controls {
+  display: flex;
+  gap: 12px;
+  margin-bottom: 20px;
+  flex-wrap: wrap;
+}
+
+.list-controls__search {
+  flex: 1;
+  min-width: 200px;
+  max-width: 400px;
+}
+
+/* Stats in project cards */
+.project-stats {
+  display: flex;
+  gap: 16px;
+  margin-top: 12px;
+  padding-top: 12px;
+  border-top: 1px solid var(--border-primary);
+}
+
+.project-stats__item {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.project-stats__value {
+  font-size: 1rem;
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+.project-stats__label {
+  font-size: 0.6875rem;
+  color: var(--text-muted);
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+}
+
+/* Page header enhancements */
+.page-header__info {
+  flex: 1;
+}
+
+.page-header__title-row {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  margin-bottom: 4px;
+}
+
+.page-header__meta {
+  display: flex;
+  gap: 16px;
+  margin-top: 8px;
+  font-size: 0.8125rem;
+  color: var(--text-muted);
+}
+
+.meta-item {
+  display: flex;
+  align-items: center;
+  gap: 4px;
+}
+
+/* Package card styles */
+.package-card__header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 12px;
+  margin-bottom: 8px;
+}
+
+.package-card__header h3 {
+  margin-bottom: 0;
+}
+
+.package-stats {
+  display: flex;
+  gap: 20px;
+  margin: 16px 0;
+  padding: 12px 0;
+  border-top: 1px solid var(--border-primary);
+  border-bottom: 1px solid var(--border-primary);
+}
+
+.package-stats__item {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.package-stats__value {
+  font-size: 1.125rem;
+  font-weight: 600;
+  color: var(--text-primary);
+}
+
+.package-stats__label {
+  font-size: 0.6875rem;
+  color: var(--text-muted);
+  text-transform: uppercase;
+  letter-spacing: 0.05em;
+}
+
+.latest-tag {
+  font-size: 0.75rem;
+  color: var(--text-secondary);
+}
+
+.latest-tag strong {
+  color: var(--accent-primary);
+}
+
+/* List controls select */
+.list-controls__select {
+  padding: 8px 32px 8px 12px;
+  background: var(--bg-tertiary);
+  border: 1px solid var(--border-primary);
+  border-radius: var(--radius-md);
+  font-size: 0.8125rem;
+  color: var(--text-secondary);
+  cursor: pointer;
+  transition: all var(--transition-fast);
+  appearance: none;
+  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
+  background-repeat: no-repeat;
+  background-position: right 10px center;
+}
+
+.list-controls__select:hover {
+  background-color: var(--bg-hover);
+  border-color: var(--border-secondary);
+}
+
+.list-controls__select:focus {
+  outline: none;
+  border-color: var(--accent-primary);
+  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
+}
+
+/* Form row for side-by-side inputs */
+.form-row {
+  display: flex;
+  gap: 16px;
+}
+
+.form-row .form-group {
+  flex: 1;
+}
+
 /* Breadcrumb */
 .breadcrumb {
  display: flex;
--- a/frontend/src/pages/Home.tsx
+++ b/frontend/src/pages/Home.tsx
@@ -1,33 +1,67 @@
-import { useState, useEffect } from 'react';
-import { Link } from 'react-router-dom';
-import { Project } from '../types';
+import { useState, useEffect, useCallback } from 'react';
+import { Link, useSearchParams } from 'react-router-dom';
+import { Project, PaginatedResponse } from '../types';
 import { listProjects, createProject } from '../api';
+import { Badge } from '../components/Badge';
+import { SearchInput } from '../components/SearchInput';
+import { SortDropdown, SortOption } from '../components/SortDropdown';
+import { FilterChip, FilterChipGroup } from '../components/FilterChip';
+import { Pagination } from '../components/Pagination';
 import './Home.css';

+const SORT_OPTIONS: SortOption[] = [
+  { value: 'name', label: 'Name' },
+  { value: 'created_at', label: 'Created' },
+  { value: 'updated_at', label: 'Updated' },
+];
+
 function Home() {
-  const [projects, setProjects] = useState<Project[]>([]);
+  const [searchParams, setSearchParams] = useSearchParams();
+
+  const [projectsData, setProjectsData] = useState<PaginatedResponse<Project> | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [showForm, setShowForm] = useState(false);
  const [newProject, setNewProject] = useState({ name: '', description: '', is_public: true });
  const [creating, setCreating] = useState(false);

-  useEffect(() => {
-    loadProjects();
-  }, []);
+  // Get params from URL
+  const page = parseInt(searchParams.get('page') || '1', 10);
+  const search = searchParams.get('search') || '';
+  const sort = searchParams.get('sort') || 'name';
+  const order = (searchParams.get('order') || 'asc') as 'asc' | 'desc';

-  async function loadProjects() {
+  const updateParams = useCallback(
+    (updates: Record<string, string | undefined>) => {
+      const newParams = new URLSearchParams(searchParams);
+      Object.entries(updates).forEach(([key, value]) => {
+        if (value === undefined || value === '' || (key === 'page' && value === '1')) {
+          newParams.delete(key);
+        } else {
+          newParams.set(key, value);
+        }
+      });
+      setSearchParams(newParams);
+    },
+    [searchParams, setSearchParams]
+  );
+
+  const loadProjects = useCallback(async () => {
    try {
      setLoading(true);
-      const data = await listProjects();
-      setProjects(data);
+      const data = await listProjects({ page, search, sort, order });
+      setProjectsData(data);
      setError(null);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load projects');
    } finally {
      setLoading(false);
    }
-  }
+  }, [page, search, sort, order]);
+
+  useEffect(() => {
+    loadProjects();
+  }, [loadProjects]);

  async function handleCreateProject(e: React.FormEvent) {
    e.preventDefault();
@@ -44,7 +78,27 @@ function Home() {
    }
  }

-  if (loading) {
+  const handleSearchChange = (value: string) => {
+    updateParams({ search: value, page: '1' });
+  };
+
+  const handleSortChange = (newSort: string, newOrder: 'asc' | 'desc') => {
+    updateParams({ sort: newSort, order: newOrder, page: '1' });
+  };
+
+  const handlePageChange = (newPage: number) => {
+    updateParams({ page: String(newPage) });
+  };
+
+  const clearFilters = () => {
+    setSearchParams({});
+  };
+
+  const hasActiveFilters = search !== '';
+  const projects = projectsData?.items || [];
+  const pagination = projectsData?.pagination;
+
+  if (loading && !projectsData) {
    return <div className="loading">Loading projects...</div>;
  }

@@ -99,27 +153,65 @@ function Home() {
        </form>
      )}

+      <div className="list-controls">
+        <SearchInput
+          value={search}
+          onChange={handleSearchChange}
+          placeholder="Search projects..."
+          className="list-controls__search"
+        />
+        <SortDropdown options={SORT_OPTIONS} value={sort} order={order} onChange={handleSortChange} />
+      </div>
+
+      {hasActiveFilters && (
+        <FilterChipGroup onClearAll={clearFilters}>
+          {search && <FilterChip label="Search" value={search} onRemove={() => handleSearchChange('')} />}
+        </FilterChipGroup>
+      )}
+
      {projects.length === 0 ? (
        <div className="empty-state">
-          <p>No projects yet. Create your first project to get started!</p>
+          {hasActiveFilters ? (
+            <p>No projects match your filters. Try adjusting your search.</p>
+          ) : (
+            <p>No projects yet. Create your first project to get started!</p>
+          )}
        </div>
      ) : (
-        <div className="project-grid">
-          {projects.map((project) => (
-            <Link to={`/project/${project.name}`} key={project.id} className="project-card card">
-              <h3>{project.name}</h3>
-              {project.description && <p>{project.description}</p>}
-              <div className="project-meta">
-                <span className={`badge ${project.is_public ? 'badge-public' : 'badge-private'}`}>
-                  {project.is_public ? 'Public' : 'Private'}
-                </span>
-                <span className="date">
-                  Created {new Date(project.created_at).toLocaleDateString()}
-                </span>
-              </div>
-            </Link>
-          ))}
-        </div>
+        <>
+          <div className="project-grid">
+            {projects.map((project) => (
+              <Link to={`/project/${project.name}`} key={project.id} className="project-card card">
+                <h3>{project.name}</h3>
+                {project.description && <p>{project.description}</p>}
+                <div className="project-meta">
+                  <Badge variant={project.is_public ? 'public' : 'private'}>
+                    {project.is_public ? 'Public' : 'Private'}
+                  </Badge>
+                  <div className="project-meta__dates">
+                    <span className="date">Created {new Date(project.created_at).toLocaleDateString()}</span>
+                    {project.updated_at !== project.created_at && (
+                      <span className="date">Updated {new Date(project.updated_at).toLocaleDateString()}</span>
+                    )}
+                  </div>
+                </div>
+                <div className="project-meta__owner">
+                  <span className="owner">by {project.created_by}</span>
+                </div>
+              </Link>
+            ))}
+          </div>
+
+          {pagination && pagination.total_pages > 1 && (
+            <Pagination
+              page={pagination.page}
+              totalPages={pagination.total_pages}
+              total={pagination.total}
+              limit={pagination.limit}
+              onPageChange={handlePageChange}
+            />
+          )}
+        </>
      )}
    </div>
  );
--- a/frontend/src/pages/PackagePage.css
+++ b/frontend/src/pages/PackagePage.css
@@ -206,6 +206,92 @@ h2 {
  color: var(--text-primary);
 }

+/* Section header */
+.section-header {
+  margin-bottom: 16px;
+}
+
+.section-header h2 {
+  margin-bottom: 0;
+}
+
+/* Package header stats */
+.package-header-stats {
+  display: flex;
+  gap: 20px;
+  margin-top: 12px;
+  font-size: 0.875rem;
+  color: var(--text-secondary);
+}
+
+.stat-item strong {
+  color: var(--text-primary);
+}
+
+.stat-item strong.accent {
+  color: var(--accent-primary);
+}
+
+/* Artifact ID cell */
+.artifact-id-cell {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+}
+
+/* Copy button */
+.copy-btn {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  width: 24px;
+  height: 24px;
+  padding: 0;
+  background: transparent;
+  border: none;
+  border-radius: var(--radius-sm);
+  color: var(--text-muted);
+  cursor: pointer;
+  opacity: 0;
+  transition: all var(--transition-fast);
+}
+
+.artifact-id-cell:hover .copy-btn,
+tr:hover .copy-btn {
+  opacity: 1;
+}
+
+.copy-btn:hover {
+  background: var(--bg-hover);
+  color: var(--accent-primary);
+}
+
+/* Content type */
+.content-type {
+  font-size: 0.75rem;
+  color: var(--text-muted);
+}
+
+/* Created cell */
+.created-cell {
+  display: flex;
+  flex-direction: column;
+  gap: 2px;
+}
+
+.created-by {
+  font-size: 0.75rem;
+  color: var(--text-muted);
+}
+
+/* Cell truncate */
+.cell-truncate {
+  max-width: 150px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
 /* Responsive adjustments */
@media (max-width: 768px) {
  .upload-form {
@@ -217,11 +303,8 @@ h2 {
    min-width: 100%;
  }

-  .tags-table {
-    overflow-x: auto;
-  }
-
-  .tags-table table {
-    min-width: 500px;
+  .package-header-stats {
+    flex-wrap: wrap;
+    gap: 12px;
  }
 }
--- a/frontend/src/pages/PackagePage.tsx
+++ b/frontend/src/pages/PackagePage.tsx
@@ -1,13 +1,64 @@
-import { useState, useEffect, useRef } from 'react';
-import { useParams, Link } from 'react-router-dom';
-import { Tag } from '../types';
-import { listTags, uploadArtifact, getDownloadUrl } from '../api';
+import { useState, useEffect, useRef, useCallback } from 'react';
+import { useParams, useSearchParams, useNavigate } from 'react-router-dom';
+import { TagDetail, Package, PaginatedResponse } from '../types';
+import { listTags, uploadArtifact, getDownloadUrl, getPackage } from '../api';
+import { Breadcrumb } from '../components/Breadcrumb';
+import { Badge } from '../components/Badge';
+import { SearchInput } from '../components/SearchInput';
+import { SortDropdown, SortOption } from '../components/SortDropdown';
+import { FilterChip, FilterChipGroup } from '../components/FilterChip';
+import { DataTable } from '../components/DataTable';
+import { Pagination } from '../components/Pagination';
 import './Home.css';
 import './PackagePage.css';

+const SORT_OPTIONS: SortOption[] = [
+  { value: 'name', label: 'Name' },
+  { value: 'created_at', label: 'Created' },
+];
+
+function formatBytes(bytes: number): string {
+  if (bytes === 0) return '0 B';
+  const k = 1024;
+  const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
+}
+
+function CopyButton({ text }: { text: string }) {
+  const [copied, setCopied] = useState(false);
+
+  const handleCopy = async (e: React.MouseEvent) => {
+    e.preventDefault();
+    e.stopPropagation();
+    await navigator.clipboard.writeText(text);
+    setCopied(true);
+    setTimeout(() => setCopied(false), 2000);
+  };
+
+  return (
+    <button className="copy-btn" onClick={handleCopy} title="Copy to clipboard">
+      {copied ? (
+        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+          <polyline points="20 6 9 17 4 12" />
+        </svg>
+      ) : (
+        <svg width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2">
+          <rect x="9" y="9" width="13" height="13" rx="2" ry="2" />
+          <path d="M5 15H4a2 2 0 0 1-2-2V4a2 2 0 0 1 2-2h9a2 2 0 0 1 2 2v1" />
+        </svg>
+      )}
+    </button>
+  );
+}
+
 function PackagePage() {
  const { projectName, packageName } = useParams<{ projectName: string; packageName: string }>();
-  const [tags, setTags] = useState<Tag[]>([]);
+  const navigate = useNavigate();
+  const [searchParams, setSearchParams] = useSearchParams();
+
+  const [pkg, setPkg] = useState<Package | null>(null);
+  const [tagsData, setTagsData] = useState<PaginatedResponse<TagDetail> | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [uploading, setUploading] = useState(false);
@@ -15,24 +66,61 @@ function PackagePage() {
  const [tag, setTag] = useState('');
  const fileInputRef = useRef<HTMLInputElement>(null);

-  useEffect(() => {
-    if (projectName && packageName) {
-      loadTags();
-    }
-  }, [projectName, packageName]);
+  // Get params from URL
+  const page = parseInt(searchParams.get('page') || '1', 10);
+  const search = searchParams.get('search') || '';
+  const sort = searchParams.get('sort') || 'name';
+  const order = (searchParams.get('order') || 'asc') as 'asc' | 'desc';
+
+  const updateParams = useCallback(
+    (updates: Record<string, string | undefined>) => {
+      const newParams = new URLSearchParams(searchParams);
+      Object.entries(updates).forEach(([key, value]) => {
+        if (value === undefined || value === '' || (key === 'page' && value === '1')) {
+          newParams.delete(key);
+        } else {
+          newParams.set(key, value);
+        }
+      });
+      setSearchParams(newParams);
+    },
+    [searchParams, setSearchParams]
+  );
+
+  const loadData = useCallback(async () => {
+    if (!projectName || !packageName) return;

-  async function loadTags() {
    try {
      setLoading(true);
-      const data = await listTags(projectName!, packageName!);
-      setTags(data);
+      const [pkgData, tagsResult] = await Promise.all([
+        getPackage(projectName, packageName),
+        listTags(projectName, packageName, { page, search, sort, order }),
+      ]);
+      setPkg(pkgData);
+      setTagsData(tagsResult);
      setError(null);
    } catch (err) {
-      setError(err instanceof Error ? err.message : 'Failed to load tags');
+      setError(err instanceof Error ? err.message : 'Failed to load data');
    } finally {
      setLoading(false);
    }
-  }
+  }, [projectName, packageName, page, search, sort, order]);
+
+  useEffect(() => {
+    loadData();
+  }, [loadData]);
+
+  // Keyboard navigation - go back with backspace
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Backspace' && !['INPUT', 'TEXTAREA'].includes((e.target as HTMLElement).tagName)) {
+        e.preventDefault();
+        navigate(`/project/${projectName}`);
+      }
+    };
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, [navigate, projectName]);

  async function handleUpload(e: React.FormEvent) {
    e.preventDefault();
@@ -51,7 +139,7 @@ function PackagePage() {
      if (fileInputRef.current) {
        fileInputRef.current.value = '';
      }
-      loadTags();
+      loadData();
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Upload failed');
    } finally {
@@ -59,18 +147,148 @@ function PackagePage() {
    }
  }

-  if (loading) {
+  const handleSearchChange = (value: string) => {
+    updateParams({ search: value, page: '1' });
+  };
+
+  const handleSortChange = (newSort: string, newOrder: 'asc' | 'desc') => {
+    updateParams({ sort: newSort, order: newOrder, page: '1' });
+  };
+
+  const handlePageChange = (newPage: number) => {
+    updateParams({ page: String(newPage) });
+  };
+
+  const clearFilters = () => {
+    setSearchParams({});
+  };
+
+  const hasActiveFilters = search !== '';
+  const tags = tagsData?.items || [];
+  const pagination = tagsData?.pagination;
+
+  const columns = [
+    {
+      key: 'name',
+      header: 'Tag',
+      sortable: true,
+      render: (t: TagDetail) => <strong>{t.name}</strong>,
+    },
+    {
+      key: 'artifact_id',
+      header: 'Artifact ID',
+      render: (t: TagDetail) => (
+        <div className="artifact-id-cell">
+          <code className="artifact-id">{t.artifact_id.substring(0, 12)}...</code>
+          <CopyButton text={t.artifact_id} />
+        </div>
+      ),
+    },
+    {
+      key: 'size',
+      header: 'Size',
+      render: (t: TagDetail) => <span>{formatBytes(t.artifact_size)}</span>,
+    },
+    {
+      key: 'content_type',
+      header: 'Type',
+      render: (t: TagDetail) => (
+        <span className="content-type">{t.artifact_content_type || '-'}</span>
+      ),
+    },
+    {
+      key: 'original_name',
+      header: 'Filename',
+      className: 'cell-truncate',
+      render: (t: TagDetail) => (
+        <span title={t.artifact_original_name || undefined}>{t.artifact_original_name || '-'}</span>
+      ),
+    },
+    {
+      key: 'created_at',
+      header: 'Created',
+      sortable: true,
+      render: (t: TagDetail) => (
+        <div className="created-cell">
+          <span>{new Date(t.created_at).toLocaleString()}</span>
+          <span className="created-by">by {t.created_by}</span>
+        </div>
+      ),
+    },
+    {
+      key: 'actions',
+      header: 'Actions',
+      render: (t: TagDetail) => (
+        <a
+          href={getDownloadUrl(projectName!, packageName!, t.name)}
+          className="btn btn-secondary btn-small"
+          download
+        >
+          Download
+        </a>
+      ),
+    },
+  ];
+
+  if (loading && !tagsData) {
    return <div className="loading">Loading...</div>;
  }

  return (
    <div className="home">
-      <nav className="breadcrumb">
-        <Link to="/">Projects</Link> / <Link to={`/project/${projectName}`}>{projectName}</Link> / <span>{packageName}</span>
-      </nav>
+      <Breadcrumb
+        items={[
+          { label: 'Projects', href: '/' },
+          { label: projectName!, href: `/project/${projectName}` },
+          { label: packageName! },
+        ]}
+      />

      <div className="page-header">
-        <h1>{packageName}</h1>
+        <div className="page-header__info">
+          <div className="page-header__title-row">
+            <h1>{packageName}</h1>
+            {pkg && <Badge variant="default">{pkg.format}</Badge>}
+          </div>
+          {pkg?.description && <p className="description">{pkg.description}</p>}
+          <div className="page-header__meta">
+            <span className="meta-item">
+              in <a href={`/project/${projectName}`}>{projectName}</a>
+            </span>
+            {pkg && (
+              <>
+                <span className="meta-item">Created {new Date(pkg.created_at).toLocaleDateString()}</span>
+                {pkg.updated_at !== pkg.created_at && (
+                  <span className="meta-item">Updated {new Date(pkg.updated_at).toLocaleDateString()}</span>
+                )}
+              </>
+            )}
+          </div>
+          {pkg && (pkg.tag_count !== undefined || pkg.artifact_count !== undefined) && (
+            <div className="package-header-stats">
+              {pkg.tag_count !== undefined && (
+                <span className="stat-item">
+                  <strong>{pkg.tag_count}</strong> tags
+                </span>
+              )}
+              {pkg.artifact_count !== undefined && (
+                <span className="stat-item">
+                  <strong>{pkg.artifact_count}</strong> artifacts
+                </span>
+              )}
+              {pkg.total_size !== undefined && pkg.total_size > 0 && (
+                <span className="stat-item">
+                  <strong>{formatBytes(pkg.total_size)}</strong> total
+                </span>
+              )}
+              {pkg.latest_tag && (
+                <span className="stat-item">
+                  Latest: <strong className="accent">{pkg.latest_tag}</strong>
+                </span>
+              )}
+            </div>
+          )}
+        </div>
      </div>

      {error && <div className="error-message">{error}</div>}
@@ -81,12 +299,7 @@ function PackagePage() {
        <form onSubmit={handleUpload} className="upload-form">
          <div className="form-group">
            <label htmlFor="file">File</label>
-            <input
-              id="file"
-              type="file"
-              ref={fileInputRef}
-              required
-            />
+            <input id="file" type="file" ref={fileInputRef} required />
          </div>
          <div className="form-group">
            <label htmlFor="tag">Tag (optional)</label>
@@ -104,42 +317,54 @@ function PackagePage() {
        </form>
      </div>

-      <h2>Tags / Versions</h2>
-      {tags.length === 0 ? (
-        <div className="empty-state">
-          <p>No tags yet. Upload an artifact with a tag to create one!</p>
-        </div>
-      ) : (
-        <div className="tags-table">
-          <table>
-            <thead>
-              <tr>
-                <th>Tag</th>
-                <th>Artifact ID</th>
-                <th>Created</th>
-                <th>Actions</th>
-              </tr>
-            </thead>
-            <tbody>
-              {tags.map((t) => (
-                <tr key={t.id}>
-                  <td><strong>{t.name}</strong></td>
-                  <td className="artifact-id">{t.artifact_id.substring(0, 12)}...</td>
-                  <td>{new Date(t.created_at).toLocaleString()}</td>
-                  <td>
-                    <a
-                      href={getDownloadUrl(projectName!, packageName!, t.name)}
-                      className="btn btn-secondary btn-small"
-                      download
-                    >
-                      Download
-                    </a>
-                  </td>
-                </tr>
-              ))}
-            </tbody>
-          </table>
-        </div>
+      <div className="section-header">
+        <h2>Tags / Versions</h2>
+      </div>
+
+      <div className="list-controls">
+        <SearchInput
+          value={search}
+          onChange={handleSearchChange}
+          placeholder="Search tags..."
+          className="list-controls__search"
+        />
+        <SortDropdown options={SORT_OPTIONS} value={sort} order={order} onChange={handleSortChange} />
+      </div>
+
+      {hasActiveFilters && (
+        <FilterChipGroup onClearAll={clearFilters}>
+          {search && <FilterChip label="Search" value={search} onRemove={() => handleSearchChange('')} />}
+        </FilterChipGroup>
+      )}
+
+      <DataTable
+        data={tags}
+        columns={columns}
+        keyExtractor={(t) => t.id}
+        emptyMessage={
+          hasActiveFilters
+            ? 'No tags match your filters. Try adjusting your search.'
+            : 'No tags yet. Upload an artifact with a tag to create one!'
+        }
+        onSort={(key) => {
+          if (key === sort) {
+            handleSortChange(key, order === 'asc' ? 'desc' : 'asc');
+          } else {
+            handleSortChange(key, 'asc');
+          }
+        }}
+        sortKey={sort}
+        sortOrder={order}
+      />
+
+      {pagination && pagination.total_pages > 1 && (
+        <Pagination
+          page={pagination.page}
+          totalPages={pagination.total_pages}
+          total={pagination.total}
+          limit={pagination.limit}
+          onPageChange={handlePageChange}
+        />
      )}

      <div className="usage-section card">
--- a/frontend/src/pages/ProjectPage.tsx
+++ b/frontend/src/pages/ProjectPage.tsx
@@ -1,48 +1,107 @@
-import { useState, useEffect } from 'react';
-import { useParams, Link } from 'react-router-dom';
-import { Project, Package } from '../types';
+import { useState, useEffect, useCallback } from 'react';
+import { useParams, Link, useSearchParams, useNavigate } from 'react-router-dom';
+import { Project, Package, PaginatedResponse } from '../types';
 import { getProject, listPackages, createPackage } from '../api';
+import { Breadcrumb } from '../components/Breadcrumb';
+import { Badge } from '../components/Badge';
+import { SearchInput } from '../components/SearchInput';
+import { SortDropdown, SortOption } from '../components/SortDropdown';
+import { FilterChip, FilterChipGroup } from '../components/FilterChip';
+import { Pagination } from '../components/Pagination';
 import './Home.css';

+const SORT_OPTIONS: SortOption[] = [
+  { value: 'name', label: 'Name' },
+  { value: 'created_at', label: 'Created' },
+  { value: 'updated_at', label: 'Updated' },
+];
+
+const FORMAT_OPTIONS = ['generic', 'npm', 'pypi', 'docker', 'deb', 'rpm', 'maven', 'nuget', 'helm'];
+
+function formatBytes(bytes: number): string {
+  if (bytes === 0) return '0 B';
+  const k = 1024;
+  const sizes = ['B', 'KB', 'MB', 'GB', 'TB'];
+  const i = Math.floor(Math.log(bytes) / Math.log(k));
+  return parseFloat((bytes / Math.pow(k, i)).toFixed(1)) + ' ' + sizes[i];
+}
+
 function ProjectPage() {
  const { projectName } = useParams<{ projectName: string }>();
+  const navigate = useNavigate();
+  const [searchParams, setSearchParams] = useSearchParams();
+
  const [project, setProject] = useState<Project | null>(null);
-  const [packages, setPackages] = useState<Package[]>([]);
+  const [packagesData, setPackagesData] = useState<PaginatedResponse<Package> | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);
  const [showForm, setShowForm] = useState(false);
-  const [newPackage, setNewPackage] = useState({ name: '', description: '' });
+  const [newPackage, setNewPackage] = useState({ name: '', description: '', format: 'generic', platform: 'any' });
  const [creating, setCreating] = useState(false);

-  useEffect(() => {
-    if (projectName) {
-      loadData();
-    }
-  }, [projectName]);
+  // Get params from URL
+  const page = parseInt(searchParams.get('page') || '1', 10);
+  const search = searchParams.get('search') || '';
+  const sort = searchParams.get('sort') || 'name';
+  const order = (searchParams.get('order') || 'asc') as 'asc' | 'desc';
+  const format = searchParams.get('format') || '';
+
+  const updateParams = useCallback(
+    (updates: Record<string, string | undefined>) => {
+      const newParams = new URLSearchParams(searchParams);
+      Object.entries(updates).forEach(([key, value]) => {
+        if (value === undefined || value === '' || (key === 'page' && value === '1')) {
+          newParams.delete(key);
+        } else {
+          newParams.set(key, value);
+        }
+      });
+      setSearchParams(newParams);
+    },
+    [searchParams, setSearchParams]
+  );
+
+  const loadData = useCallback(async () => {
+    if (!projectName) return;

-  async function loadData() {
    try {
      setLoading(true);
-      const [projectData, packagesData] = await Promise.all([
-        getProject(projectName!),
-        listPackages(projectName!),
+      const [projectData, packagesResult] = await Promise.all([
+        getProject(projectName),
+        listPackages(projectName, { page, search, sort, order, format: format || undefined }),
      ]);
      setProject(projectData);
-      setPackages(packagesData);
+      setPackagesData(packagesResult);
      setError(null);
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Failed to load data');
    } finally {
      setLoading(false);
    }
-  }
+  }, [projectName, page, search, sort, order, format]);
+
+  useEffect(() => {
+    loadData();
+  }, [loadData]);
+
+  // Keyboard navigation - go back with backspace
+  useEffect(() => {
+    const handleKeyDown = (e: KeyboardEvent) => {
+      if (e.key === 'Backspace' && !['INPUT', 'TEXTAREA'].includes((e.target as HTMLElement).tagName)) {
+        e.preventDefault();
+        navigate('/');
+      }
+    };
+    window.addEventListener('keydown', handleKeyDown);
+    return () => window.removeEventListener('keydown', handleKeyDown);
+  }, [navigate]);

  async function handleCreatePackage(e: React.FormEvent) {
    e.preventDefault();
    try {
      setCreating(true);
      await createPackage(projectName!, newPackage);
-      setNewPackage({ name: '', description: '' });
+      setNewPackage({ name: '', description: '', format: 'generic', platform: 'any' });
      setShowForm(false);
      loadData();
    } catch (err) {
@@ -52,7 +111,31 @@ function ProjectPage() {
    }
  }

-  if (loading) {
+  const handleSearchChange = (value: string) => {
+    updateParams({ search: value, page: '1' });
+  };
+
+  const handleSortChange = (newSort: string, newOrder: 'asc' | 'desc') => {
+    updateParams({ sort: newSort, order: newOrder, page: '1' });
+  };
+
+  const handleFormatChange = (value: string) => {
+    updateParams({ format: value, page: '1' });
+  };
+
+  const handlePageChange = (newPage: number) => {
+    updateParams({ page: String(newPage) });
+  };
+
+  const clearFilters = () => {
+    setSearchParams({});
+  };
+
+  const hasActiveFilters = search !== '' || format !== '';
+  const packages = packagesData?.items || [];
+  const pagination = packagesData?.pagination;
+
+  if (loading && !packagesData) {
    return <div className="loading">Loading...</div>;
  }

@@ -62,14 +145,29 @@ function ProjectPage() {

  return (
    <div className="home">
-      <nav className="breadcrumb">
-        <Link to="/">Projects</Link> / <span>{project.name}</span>
-      </nav>
+      <Breadcrumb
+        items={[
+          { label: 'Projects', href: '/' },
+          { label: project.name },
+        ]}
+      />

      <div className="page-header">
-        <div>
-          <h1>{project.name}</h1>
+        <div className="page-header__info">
+          <div className="page-header__title-row">
+            <h1>{project.name}</h1>
+            <Badge variant={project.is_public ? 'public' : 'private'}>
+              {project.is_public ? 'Public' : 'Private'}
+            </Badge>
+          </div>
          {project.description && <p className="description">{project.description}</p>}
+          <div className="page-header__meta">
+            <span className="meta-item">Created {new Date(project.created_at).toLocaleDateString()}</span>
+            {project.updated_at !== project.created_at && (
+              <span className="meta-item">Updated {new Date(project.updated_at).toLocaleDateString()}</span>
+            )}
+            <span className="meta-item">by {project.created_by}</span>
+          </div>
        </div>
        <button className="btn btn-primary" onClick={() => setShowForm(!showForm)}>
          {showForm ? 'Cancel' : '+ New Package'}
@@ -81,16 +179,32 @@ function ProjectPage() {
      {showForm && (
        <form className="form card" onSubmit={handleCreatePackage}>
          <h3>Create New Package</h3>
-          <div className="form-group">
-            <label htmlFor="name">Name</label>
-            <input
-              id="name"
-              type="text"
-              value={newPackage.name}
-              onChange={(e) => setNewPackage({ ...newPackage, name: e.target.value })}
-              placeholder="releases"
-              required
-            />
+          <div className="form-row">
+            <div className="form-group">
+              <label htmlFor="name">Name</label>
+              <input
+                id="name"
+                type="text"
+                value={newPackage.name}
+                onChange={(e) => setNewPackage({ ...newPackage, name: e.target.value })}
+                placeholder="releases"
+                required
+              />
+            </div>
+            <div className="form-group">
+              <label htmlFor="format">Format</label>
+              <select
+                id="format"
+                value={newPackage.format}
+                onChange={(e) => setNewPackage({ ...newPackage, format: e.target.value })}
+              >
+                {FORMAT_OPTIONS.map((f) => (
+                  <option key={f} value={f}>
+                    {f}
+                  </option>
+                ))}
+              </select>
+            </div>
          </div>
          <div className="form-group">
            <label htmlFor="description">Description</label>
@@ -108,24 +222,99 @@ function ProjectPage() {
        </form>
      )}

+      <div className="list-controls">
+        <SearchInput
+          value={search}
+          onChange={handleSearchChange}
+          placeholder="Search packages..."
+          className="list-controls__search"
+        />
+        <select
+          className="list-controls__select"
+          value={format}
+          onChange={(e) => handleFormatChange(e.target.value)}
+        >
+          <option value="">All formats</option>
+          {FORMAT_OPTIONS.map((f) => (
+            <option key={f} value={f}>
+              {f}
+            </option>
+          ))}
+        </select>
+        <SortDropdown options={SORT_OPTIONS} value={sort} order={order} onChange={handleSortChange} />
+      </div>
+
+      {hasActiveFilters && (
+        <FilterChipGroup onClearAll={clearFilters}>
+          {search && <FilterChip label="Search" value={search} onRemove={() => handleSearchChange('')} />}
+          {format && <FilterChip label="Format" value={format} onRemove={() => handleFormatChange('')} />}
+        </FilterChipGroup>
+      )}
+
      {packages.length === 0 ? (
        <div className="empty-state">
-          <p>No packages yet. Create your first package to start uploading artifacts!</p>
+          {hasActiveFilters ? (
+            <p>No packages match your filters. Try adjusting your search.</p>
+          ) : (
+            <p>No packages yet. Create your first package to start uploading artifacts!</p>
+          )}
        </div>
      ) : (
-        <div className="project-grid">
-          {packages.map((pkg) => (
-            <Link to={`/project/${projectName}/${pkg.name}`} key={pkg.id} className="project-card card">
-              <h3>{pkg.name}</h3>
-              {pkg.description && <p>{pkg.description}</p>}
-              <div className="project-meta">
-                <span className="date">
-                  Created {new Date(pkg.created_at).toLocaleDateString()}
-                </span>
-              </div>
-            </Link>
-          ))}
-        </div>
+        <>
+          <div className="project-grid">
+            {packages.map((pkg) => (
+              <Link to={`/project/${projectName}/${pkg.name}`} key={pkg.id} className="project-card card">
+                <div className="package-card__header">
+                  <h3>{pkg.name}</h3>
+                  <Badge variant="default">{pkg.format}</Badge>
+                </div>
+                {pkg.description && <p>{pkg.description}</p>}
+
+                {(pkg.tag_count !== undefined || pkg.artifact_count !== undefined) && (
+                  <div className="package-stats">
+                    {pkg.tag_count !== undefined && (
+                      <div className="package-stats__item">
+                        <span className="package-stats__value">{pkg.tag_count}</span>
+                        <span className="package-stats__label">Tags</span>
+                      </div>
+                    )}
+                    {pkg.artifact_count !== undefined && (
+                      <div className="package-stats__item">
+                        <span className="package-stats__value">{pkg.artifact_count}</span>
+                        <span className="package-stats__label">Artifacts</span>
+                      </div>
+                    )}
+                    {pkg.total_size !== undefined && pkg.total_size > 0 && (
+                      <div className="package-stats__item">
+                        <span className="package-stats__value">{formatBytes(pkg.total_size)}</span>
+                        <span className="package-stats__label">Size</span>
+                      </div>
+                    )}
+                  </div>
+                )}
+
+                <div className="project-meta">
+                  {pkg.latest_tag && (
+                    <span className="latest-tag">
+                      Latest: <strong>{pkg.latest_tag}</strong>
+                    </span>
+                  )}
+                  <span className="date">Created {new Date(pkg.created_at).toLocaleDateString()}</span>
+                </div>
+              </Link>
+            ))}
+          </div>
+
+          {pagination && pagination.total_pages > 1 && (
+            <Pagination
+              page={pagination.page}
+              totalPages={pagination.total_pages}
+              total={pagination.total}
+              limit={pagination.limit}
+              onPageChange={handlePageChange}
+            />
+          )}
+        </>
      )}
    </div>
  );
--- a/frontend/src/types.ts
+++ b/frontend/src/types.ts
@@ -51,6 +51,57 @@ export interface Tag {
  created_by: string;
 }

+export interface TagDetail extends Tag {
+  artifact_size: number;
+  artifact_content_type: string | null;
+  artifact_original_name: string | null;
+  artifact_created_at: string;
+  artifact_format_metadata: Record<string, unknown> | null;
+}
+
+export interface ArtifactTagInfo {
+  id: string;
+  name: string;
+  package_id: string;
+  package_name: string;
+  project_name: string;
+}
+
+export interface ArtifactDetail extends Artifact {
+  tags: ArtifactTagInfo[];
+}
+
+export interface PaginatedResponse<T> {
+  items: T[];
+  pagination: {
+    page: number;
+    limit: number;
+    total: number;
+    total_pages: number;
+  };
+}
+
+export interface ListParams {
+  page?: number;
+  limit?: number;
+  search?: string;
+  sort?: string;
+  order?: 'asc' | 'desc';
+}
+
+export interface TagListParams extends ListParams {}
+
+export interface PackageListParams extends ListParams {
+  format?: string;
+  platform?: string;
+}
+
+export interface ArtifactListParams extends ListParams {
+  content_type?: string;
+  created_after?: string;
+  created_before?: string;
+}
+
 export interface Consumer {
  id: string;
  package_id: string;
Author	SHA1	Message	Date
Mondo Diaz	ec6b3f0ed8	Implement database storage layer - Add connection pool configuration (pool_size, max_overflow, timeout, recycle) - Add transaction management utilities (transaction, savepoint, retry_on_deadlock) - Create repository pattern classes for all entities (Project, Package, Artifact, Tag, Upload) - Implement ref_count decrement and cleanup service - Add query helper functions (search, filtering, pagination, stats) - Add database constraints (check_ref_count_non_negative, check_size_positive) - Add performance indexes (idx_artifacts_ref_count, composite indexes for packages/tags) - Initialize Alembic migrations for future schema changes	2025-12-12 12:18:01 -06:00
Mondo Diaz	7d80bef39a	Fix: restore enhanced tags API endpoints	2025-12-12 10:57:27 -06:00
Mondo Diaz	96198dc127	Merge branch 'fix/restore-merged-features'	2025-12-12 10:55:19 -06:00
Mondo Diaz	fd06dfb3ce	Reapply "Add API endpoints for listing tagged versions and artifacts" This reverts commit `11852adc66`.	2025-12-12 10:55:15 -06:00
Mondo Diaz	11852adc66	Revert "Add API endpoints for listing tagged versions and artifacts" This reverts commit `54e33e67ce`.	2025-12-12 10:49:55 -06:00
Mondo Diaz	21555d64a3	Merge branch 'fix/restore-merged-features' into 'main' fix merge issue See merge request esv/bsf/bsf-integration/orchard/orchard-mvp!9	2025-12-12 10:48:55 -06:00
Mondo Diaz	b83f19aa52	fix merge issue	2025-12-12 10:48:55 -06:00
Mondo Diaz	5d0122fc36	Revert "Add API endpoints for listing tagged versions and artifacts" This reverts commit `54e33e67ce`.	2025-12-12 10:33:21 -06:00
Mondo Diaz	81b423e0ea	Merge branch 'feature/frontend-hierarchy-components' into 'main' Develop Frontend Components for Project, Package, and Instance Views Closes #5 See merge request esv/bsf/bsf-integration/orchard/orchard-mvp!8	2025-12-12 10:23:45 -06:00
Mondo Diaz	e89947f3d3	Develop Frontend Components for Project, Package, and Instance Views	2025-12-12 10:23:44 -06:00
Mondo Diaz	459867abdb	Merge branch 'feature/list-tagged-versions-api' into 'main' Add API endpoints for listing tagged versions and artifacts Closes #4 See merge request esv/bsf/bsf-integration/orchard/orchard-mvp!7	2025-12-12 10:23:40 -06:00
Mondo Diaz	2b5bc60a69	Add API endpoints for listing tagged versions and artifacts	2025-12-12 10:23:40 -06:00