refactor(maintenance): remove hardcoded retention and wire scheduler

RunPeriodicMaintenance и RunCleanup удалены; scheduler политик в StartBackground; deprecated /postgres/cleanup принимает policy_id.

Co-authored-by: Cursor <[email protected]>

internal/pgmonitor/maintenance_audit.go

@@ -3,81 +3,18 @@ package pgmonitor
 import (
 	"context"
 	"encoding/json"
-	"fmt"
 	"time"
 
 	"github.com/google/uuid"
 	"github.com/jackc/pgx/v5/pgxpool"
 )
 
-// CleanupPolicy names safe retention policies.
-type CleanupPolicy string
-
-const (
-	PolicyJobAuditRetention CleanupPolicy = "job_audit_retention"
-	PolicyASNCacheRetention CleanupPolicy = "asn_cache_retention"
-)
-
-// CleanupRequest for POST /postgres/cleanup.
+// CleanupRequest for deprecated POST /postgres/cleanup (use /v1/maintenance/run).
 type CleanupRequest struct {
-	Policy string `json:"policy"`
-	DryRun bool   `json:"dry_run"`
-	Limit  int    `json:"limit"`
-}
-
-// RunCleanup executes a named retention policy.
-func RunCleanup(ctx context.Context, pool *pgxpool.Pool, policy string, dryRun bool, limit int) (map[string]any, error) {
-	if pool == nil {
-		return nil, fmt.Errorf("pgmonitor: postgres not configured")
-	}
-	if limit <= 0 {
-		limit = 10000
-	}
-	if limit > 100000 {
-		limit = 100000
-	}
-	detail := map[string]any{"policy": policy, "dry_run": dryRun, "limit": limit}
-	switch CleanupPolicy(policy) {
-	case PolicyJobAuditRetention:
-		cutoff := time.Now().UTC().Add(-90 * 24 * time.Hour)
-		if dryRun {
-			var n int64
-			err := pool.QueryRow(ctx, `
-				SELECT count(*) FROM job_audit
-				WHERE created_at < $1 AND status IN ('succeeded', 'failed', 'cancelled')`, cutoff).Scan(&n)
-			detail["would_delete"] = n
-			return detail, err
-		}
-		tag, err := pool.Exec(ctx, `
-			DELETE FROM job_audit
-			WHERE id IN (
-			  SELECT id FROM job_audit
-			  WHERE created_at < $1 AND status IN ('succeeded', 'failed', 'cancelled')
-			  LIMIT $2
-			)`, cutoff, limit)
-		if err != nil {
-			return detail, err
-		}
-		detail["deleted"] = tag.RowsAffected()
-		return detail, nil
-	case PolicyASNCacheRetention:
-		cutoff := time.Now().UTC().Add(-7 * 24 * time.Hour)
-		if dryRun {
-			var n int64
-			err := pool.QueryRow(ctx, `SELECT count(*) FROM asn_prefix_cache WHERE fetched_at < $1`, cutoff).Scan(&n)
-			detail["would_delete"] = n
-			return detail, err
-		}
-		tag, err := pool.Exec(ctx, `
-			DELETE FROM asn_prefix_cache WHERE fetched_at < $1`, cutoff)
-		if err != nil {
-			return detail, err
-		}
-		detail["deleted"] = tag.RowsAffected()
-		return detail, nil
-	default:
-		return nil, fmt.Errorf("pgmonitor: unknown cleanup policy %q", policy)
-	}
+	PolicyID string `json:"policy_id"`
+	Policy   string `json:"policy"`
+	DryRun   bool   `json:"dry_run"`
+	Limit    int    `json:"limit"`
 }
 
 // InsertMaintenanceAudit records an audit row at job start.