feat(ml): add database schema, config parser, and DVC setup

- Initialize DVC with local storage backend (task 1.6)
- Create PostgreSQL schema for training_runs table (task 1.7)
- Add SQLAlchemy database connection setup (task 1.8)
- Create Pydantic config models for pipeline.yaml (task 2.1)
- Add migration runner for database setup
- Fix pyproject.toml package discovery config

services/ml/migrations/run_migrations.py

@@ -0,0 +1,65 @@
+#!/usr/bin/env python3
+"""
+Simple database migration runner for the ML service.
+Runs all SQL files in the migrations directory in order.
+"""
+
+import os
+import sys
+from pathlib import Path
+
+import psycopg2
+from psycopg2 import sql
+
+
+def get_db_connection():
+    """Get database connection from environment variables."""
+    return psycopg2.connect(
+        host=os.getenv("POSTGRES_HOST", "localhost"),
+        port=os.getenv("POSTGRES_PORT", "5432"),
+        database=os.getenv("POSTGRES_DB", "ml_service"),
+        user=os.getenv("POSTGRES_USER", "ml_user"),
+        password=os.getenv("POSTGRES_PASSWORD", "ml_password")
+    )
+
+
+def run_migrations():
+    """Run all migration files in order."""
+    migrations_dir = Path(__file__).parent
+    migration_files = sorted(migrations_dir.glob("*.sql"))
+    
+    if not migration_files:
+        print("No migration files found")
+        return
+    
+    print(f"Found {len(migration_files)} migration file(s)")
+    
+    conn = get_db_connection()
+    cur = conn.cursor()
+    
+    try:
+        for migration_file in migration_files:
+            print(f"Running migration: {migration_file.name}")
+            
+            with open(migration_file, 'r') as f:
+                migration_sql = f.read()
+            
+            cur.execute(migration_sql)
+            conn.commit()
+            
+            print(f"  ✓ {migration_file.name} completed")
+        
+        print("\nAll migrations completed successfully")
+        
+    except Exception as e:
+        conn.rollback()
+        print(f"\n✗ Migration failed: {e}", file=sys.stderr)
+        sys.exit(1)
+        
+    finally:
+        cur.close()
+        conn.close()
+
+
+if __name__ == "__main__":
+    run_migrations()