83 lines
3.4 KiB
Python
83 lines
3.4 KiB
Python
"""
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Database migration script to add indexes and constraints to existing database.
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Run this after updating the models to apply schema changes to production database.
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"""
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from postgresql_models import engine, Base
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from sqlalchemy import text
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def migrate_database():
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print("Starting database migration...")
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with engine.connect() as conn:
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# Start transaction
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trans = conn.begin()
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try:
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# Add indexes if they don't exist (PostgreSQL syntax)
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indexes = [
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"CREATE INDEX IF NOT EXISTS idx_profile_name ON profiles(name)",
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"CREATE INDEX IF NOT EXISTS idx_song_title ON songs(title)",
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"CREATE INDEX IF NOT EXISTS idx_song_artist ON songs(artist)",
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"CREATE INDEX IF NOT EXISTS idx_song_band ON songs(band)",
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"CREATE INDEX IF NOT EXISTS idx_plan_date ON plans(date)",
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"CREATE INDEX IF NOT EXISTS idx_plan_profile ON plans(profile_id)",
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"CREATE INDEX IF NOT EXISTS idx_plan_songs_plan ON plan_songs(plan_id)",
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"CREATE INDEX IF NOT EXISTS idx_plan_songs_order ON plan_songs(plan_id, order_index)",
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"CREATE INDEX IF NOT EXISTS idx_profile_songs_profile ON profile_songs(profile_id)",
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"CREATE INDEX IF NOT EXISTS idx_profile_song_keys ON profile_song_keys(profile_id, song_id)"
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]
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for idx_sql in indexes:
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print(f"Creating index: {idx_sql}")
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conn.execute(text(idx_sql))
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# Add unique constraints if they don't exist
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constraints = [
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("plan_songs", "uq_plan_song", "plan_id, song_id"),
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("profile_songs", "uq_profile_song", "profile_id, song_id"),
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("profile_song_keys", "uq_profile_song_key", "profile_id, song_id")
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]
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for table, constraint_name, columns in constraints:
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try:
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check_sql = text("""
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SELECT 1 FROM pg_constraint
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WHERE conname = :constraint_name
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""")
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result = conn.execute(check_sql, {"constraint_name": constraint_name}).fetchone()
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if not result:
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constraint_sql = f"ALTER TABLE {table} ADD CONSTRAINT {constraint_name} UNIQUE ({columns})"
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print(f"Adding constraint: {constraint_sql}")
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conn.execute(text(constraint_sql))
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else:
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print(f"Constraint {constraint_name} already exists, skipping")
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except Exception as e:
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print(f"Warning: Could not add constraint {constraint_name}: {e}")
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trans.commit()
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print("Migration completed successfully!")
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except Exception as e:
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trans.rollback()
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print(f"Migration failed: {e}")
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raise
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if __name__ == "__main__":
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import sys
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print("="*60)
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print("Database Migration Script")
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print("="*60)
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print("This will add indexes and constraints to your database.")
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print("Make sure you have a backup before proceeding!")
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print("="*60)
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response = input("Continue? (yes/no): ")
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if response.lower() == 'yes':
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migrate_database()
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else:
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print("Migration cancelled.")
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sys.exit(0)
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