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

.env.example

@@ -0,0 +1,14 @@
+DB_HOST=localhost
+DB_PORT=5432
+DB_NAME=options_db
+DB_USER=quant_user
+DB_PASSWORD=change_me
+PIPELINE_SYMBOLS=SPY
+
+# For scripts/setup_postgres.py when creating role/database:
+# Use a superuser/admin account that can CREATE ROLE and CREATE DATABASE.
+POSTGRES_ADMIN_USER=postgres
+POSTGRES_ADMIN_PASSWORD=postgres
+POSTGRES_ADMIN_HOST=localhost
+POSTGRES_ADMIN_PORT=5432
+POSTGRES_ADMIN_DB=postgres