postgres service for external use

.env.example

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+# PostgreSQL Configuration
+POSTGRES_USER=postgres
+POSTGRES_PASSWORD=postgres_secure_password
+POSTGRES_DB=postgres
+
+# Backup Configuration
+BACKUP_DIR=./backups
+BACKUP_RETENTION_DAYS=7
+
+# Resource Limits (for container configuration)
+# Recommended: 2 CPU cores, 4GB RAM minimum
+POSTGRES_CPU_LIMIT=2
+POSTGRES_MEMORY_LIMIT=4G