fix: add automatic migration system to db_init.py

Added migration tracking and execution to db_init.py:
- Created schema_migrations table to track applied migrations
- Added run_migrations() to automatically apply pending SQL files
- Migrations from backend/migrations/*.sql are now applied on startup

This fixes the missing email verification columns (migration 003).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

backend/db_init.py

@@ -91,6 +91,107 @@ def get_profile_count():
         print(f"Error getting profile count: {e}")
         return -1
 
+def ensure_migration_table():
+    """Create migration tracking table if it doesn't exist."""
+    try:
+        conn = get_connection()
+        cur = conn.cursor()
+        cur.execute("""
+            CREATE TABLE IF NOT EXISTS schema_migrations (
+                id SERIAL PRIMARY KEY,
+                filename VARCHAR(255) UNIQUE NOT NULL,
+                applied_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP
+            )
+        """)
+        conn.commit()
+        cur.close()
+        conn.close()
+        return True
+    except Exception as e:
+        print(f"Error creating migration table: {e}")
+        return False
+
+def get_applied_migrations():
+    """Get list of already applied migrations."""
+    try:
+        conn = get_connection()
+        cur = conn.cursor()
+        cur.execute("SELECT filename FROM schema_migrations ORDER BY filename")
+        migrations = [row[0] for row in cur.fetchall()]
+        cur.close()
+        conn.close()
+        return migrations
+    except Exception as e:
+        print(f"Error getting applied migrations: {e}")
+        return []
+
+def apply_migration(filepath, filename):
+    """Apply a single migration file."""
+    try:
+        with open(filepath, 'r') as f:
+            migration_sql = f.read()
+
+        conn = get_connection()
+        cur = conn.cursor()
+
+        # Execute migration
+        cur.execute(migration_sql)
+
+        # Record migration
+        cur.execute(
+            "INSERT INTO schema_migrations (filename) VALUES (%s)",
+            (filename,)
+        )
+
+        conn.commit()
+        cur.close()
+        conn.close()
+        print(f"  ✓ Applied: {filename}")
+        return True
+    except Exception as e:
+        print(f"  ✗ Failed to apply {filename}: {e}")
+        return False
+
+def run_migrations(migrations_dir="/app/migrations"):
+    """Run all pending migrations."""
+    import glob
+
+    if not os.path.exists(migrations_dir):
+        print("✓ No migrations directory found")
+        return True
+
+    # Ensure migration tracking table exists
+    if not ensure_migration_table():
+        return False
+
+    # Get already applied migrations
+    applied = get_applied_migrations()
+
+    # Get all migration files
+    migration_files = sorted(glob.glob(os.path.join(migrations_dir, "*.sql")))
+
+    if not migration_files:
+        print("✓ No migration files found")
+        return True
+
+    # Apply pending migrations
+    pending = []
+    for filepath in migration_files:
+        filename = os.path.basename(filepath)
+        if filename not in applied:
+            pending.append((filepath, filename))
+
+    if not pending:
+        print(f"✓ All {len(applied)} migrations already applied")
+        return True
+
+    print(f"  Found {len(pending)} pending migration(s)...")
+    for filepath, filename in pending:
+        if not apply_migration(filepath, filename):
+            return False
+
+    return True
+
 if __name__ == "__main__":
     print("═══════════════════════════════════════════════════════════")
     print("MITAI JINKENDO - Database Initialization (v9c)")
@@ -109,6 +210,12 @@ if __name__ == "__main__":
     else:
         print("✓ Schema already exists")
 
+    # Run migrations
+    print("\nRunning database migrations...")
+    if not run_migrations():
+        print("✗ Migration failed")
+        sys.exit(1)
+
     # Check for migration
     print("\nChecking for SQLite data migration...")
     sqlite_db = "/app/data/bodytrack.db"