feat(db): implement PostgreSQL monitoring and maintenance features

Added PostgreSQL monitoring and maintenance capabilities to the API, including new endpoints for instance-level metrics, maintenance operations, and job scheduling. Updated the HTTP API to support PostgreSQL monitoring routes and integrated a background scheduler for metrics collection. Enhanced the CLI with database commands for maintenance tasks. Updated documentation to reflect these changes.

cmd/evobgp-api/main.go

@@ -12,6 +12,7 @@ import (
 
 	"evobgp/internal/birdfmt"
 	"evobgp/internal/config"
+	"evobgp/internal/dbcli"
 	"evobgp/internal/httpapi"
 	"evobgp/internal/observability"
 	"evobgp/internal/platform"
@@ -19,6 +20,9 @@ import (
 )
 
 func main() {
+	if len(os.Args) > 1 && os.Args[1] == "db" {
+		os.Exit(dbcli.Run(os.Args[2:]))
+	}
 	cfg := config.Load()
 	seedDemo := os.Getenv("EVOBGP_SEED_DEMO") != "0"
 	opts := httpapi.Options{
@@ -39,6 +43,7 @@ func main() {
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
 	defer stop()
 
+	srv.StartBackground(ctx)
 	startBirdMetricsPoller(ctx)
 
 	httpSrv := &http.Server{