Replace hardcoded DB credentials with environment-driven configuration.

Centralize DB settings in ingestion config, remove embedded secrets from ingestion helpers, and add an idempotent PostgreSQL bootstrap script to create role/database and apply schema safely.

Made-with: Cursor

src/data/ingestion/db_connect.py

@@ -0,0 +1,13 @@
+from sqlalchemy import create_engine
+from option_pricing.src.data.ingestion.config.settings import DB_CONFIG
+
+def build_db_url() -> str:
+    return (
+        f"postgresql+psycopg2://{DB_CONFIG['user']}:{DB_CONFIG['password']}"
+        f"@{DB_CONFIG['host']}:{DB_CONFIG['port']}/{DB_CONFIG['database']}"
+    )
+
+def db_engine():
+    db_url = build_db_url()
+    engine = create_engine(db_url, future=True)
+    return engine