add database initialization scripts

scripts/init_database/00_init_user.sh

@@ -0,0 +1,40 @@
+#!/bin/bash
+# Initialize database user and database
+# This script runs before SQL files in docker-entrypoint-initdb.d
+# It must be named with 00_ prefix to run first
+
+set -e
+
+APP_DB_NAME="${APP_DB_NAME:-ai_conversations}"
+APP_DB_USER="${APP_DB_USER:-myapp_user}"
+APP_DB_PASSWORD="${APP_DB_PASSWORD:-secure_password_123}"
+
+echo "Creating database user: $APP_DB_USER"
+# Create user
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+    DO \$\$
+    BEGIN
+        IF NOT EXISTS (SELECT FROM pg_catalog.pg_user WHERE usename = '$APP_DB_USER') THEN
+            CREATE USER $APP_DB_USER WITH PASSWORD '$APP_DB_PASSWORD';
+        END IF;
+    END
+    \$\$;
+    ALTER USER $APP_DB_USER CREATEDB;
+EOSQL
+
+echo "Creating database: $APP_DB_NAME"
+# Create database
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$POSTGRES_DB" <<-EOSQL
+    SELECT 'CREATE DATABASE $APP_DB_NAME'
+    WHERE NOT EXISTS (SELECT FROM pg_database WHERE datname = '$APP_DB_NAME')\gexec
+    GRANT ALL PRIVILEGES ON DATABASE $APP_DB_NAME TO $APP_DB_USER;
+EOSQL
+
+echo "Granting schema privileges"
+# Grant schema privileges
+psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname "$APP_DB_NAME" <<-EOSQL
+    GRANT ALL ON SCHEMA public TO $APP_DB_USER;
+EOSQL
+
+echo "Database initialization complete!"
+