Add auto-migration for package_versions triggers (#56)

backend/app/database.py

@@ -151,6 +151,84 @@ def _run_migrations():
             END IF;
         END $$;
         """,
+        # Add package_versions indexes and triggers (007_package_versions.sql)
+        """
+        DO $$
+        BEGIN
+            -- Create indexes for package_versions if table exists
+            IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'package_versions') THEN
+                -- Indexes for common queries
+                IF NOT EXISTS (SELECT 1 FROM pg_indexes WHERE indexname = 'idx_package_versions_package_id') THEN
+                    CREATE INDEX idx_package_versions_package_id ON package_versions(package_id);
+                END IF;
+                IF NOT EXISTS (SELECT 1 FROM pg_indexes WHERE indexname = 'idx_package_versions_artifact_id') THEN
+                    CREATE INDEX idx_package_versions_artifact_id ON package_versions(artifact_id);
+                END IF;
+                IF NOT EXISTS (SELECT 1 FROM pg_indexes WHERE indexname = 'idx_package_versions_package_version') THEN
+                    CREATE INDEX idx_package_versions_package_version ON package_versions(package_id, version);
+                END IF;
+            END IF;
+        END $$;
+        """,
+        # Create ref_count trigger functions for package_versions
+        """
+        CREATE OR REPLACE FUNCTION increment_version_ref_count()
+        RETURNS TRIGGER AS $$
+        BEGIN
+            UPDATE artifacts SET ref_count = ref_count + 1 WHERE id = NEW.artifact_id;
+            RETURN NEW;
+        END;
+        $$ LANGUAGE plpgsql;
+        """,
+        """
+        CREATE OR REPLACE FUNCTION decrement_version_ref_count()
+        RETURNS TRIGGER AS $$
+        BEGIN
+            UPDATE artifacts SET ref_count = ref_count - 1 WHERE id = OLD.artifact_id;
+            RETURN OLD;
+        END;
+        $$ LANGUAGE plpgsql;
+        """,
+        # Create triggers for package_versions ref_count
+        """
+        DO $$
+        BEGIN
+            IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'package_versions') THEN
+                -- Drop and recreate triggers to ensure they're current
+                DROP TRIGGER IF EXISTS package_versions_ref_count_insert ON package_versions;
+                CREATE TRIGGER package_versions_ref_count_insert
+                    AFTER INSERT ON package_versions
+                    FOR EACH ROW
+                    EXECUTE FUNCTION increment_version_ref_count();
+
+                DROP TRIGGER IF EXISTS package_versions_ref_count_delete ON package_versions;
+                CREATE TRIGGER package_versions_ref_count_delete
+                    AFTER DELETE ON package_versions
+                    FOR EACH ROW
+                    EXECUTE FUNCTION decrement_version_ref_count();
+            END IF;
+        END $$;
+        """,
+        # Migrate existing semver tags to package_versions
+        """
+        DO $$
+        BEGIN
+            IF EXISTS (SELECT 1 FROM information_schema.tables WHERE table_name = 'package_versions') THEN
+                -- Migrate tags that look like versions (v1.0.0, 1.2.3, 2.0.0-beta, etc.)
+                INSERT INTO package_versions (package_id, artifact_id, version, version_source, created_by, created_at)
+                SELECT
+                    t.package_id,
+                    t.artifact_id,
+                    CASE WHEN t.name LIKE 'v%' THEN substring(t.name from 2) ELSE t.name END,
+                    'migrated_from_tag',
+                    t.created_by,
+                    t.created_at
+                FROM tags t
+                WHERE t.name ~ '^v?[0-9]+\.[0-9]+(\.[0-9]+)?([-.][a-zA-Z0-9]+)?$'
+                ON CONFLICT (package_id, version) DO NOTHING;
+            END IF;
+        END $$;
+        """,
     ]
 
     with engine.connect() as conn: