feat(store): add MaintenancePolicy CRUD backend

Типы maintenance_policy, методы store.Backend и реализации для PostgreSQL и in-memory.

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

internal/store/maintenance_policy.go

@@ -0,0 +1,89 @@
+package store
+
+import (
+	"strings"
+	"time"
+)
+
+// Vacuum strategy values for maintenance_policy.vacuum_strategy.
+const (
+	VacuumStrategyNone          = "none"
+	VacuumStrategyVacuum        = "vacuum"
+	VacuumStrategyAnalyze       = "analyze"
+	VacuumStrategyVacuumAnalyze = "vacuum_analyze"
+	VacuumStrategyReindex       = "reindex"
+)
+
+// MaintenancePolicy is an instance-scoped PostgreSQL maintenance policy (control plane DB).
+type MaintenancePolicy struct {
+	ID                 string     `json:"id,omitempty"`
+	Name               string     `json:"name"`
+	TableName          string     `json:"table_name"`
+	Condition          string     `json:"condition"`
+	RetentionPeriodSec *int       `json:"retention_period_sec,omitempty"`
+	MaxRows            *int       `json:"max_rows,omitempty"`
+	VacuumStrategy     string     `json:"vacuum_strategy"`
+	Schedule           string     `json:"schedule"`
+	Enabled            bool       `json:"enabled"`
+	DryRunEnabled      bool       `json:"dry_run_enabled"`
+	LastRunAt          *time.Time `json:"last_run_at,omitempty"`
+	LastStatus         string     `json:"last_status,omitempty"`
+	LastError          string     `json:"last_error,omitempty"`
+	CreatedAt          time.Time  `json:"created_at,omitempty"`
+	UpdatedAt          time.Time  `json:"updated_at,omitempty"`
+}
+
+// MaintenancePolicyPatch is a partial update for maintenance_policy.
+type MaintenancePolicyPatch struct {
+	Name               *string `json:"name,omitempty"`
+	TableName          *string `json:"table_name,omitempty"`
+	Condition          *string `json:"condition,omitempty"`
+	RetentionPeriodSec *int    `json:"retention_period_sec,omitempty"`
+	MaxRows            *int    `json:"max_rows,omitempty"`
+	VacuumStrategy     *string `json:"vacuum_strategy,omitempty"`
+	Schedule           *string `json:"schedule,omitempty"`
+	Enabled            *bool   `json:"enabled,omitempty"`
+	DryRunEnabled      *bool   `json:"dry_run_enabled,omitempty"`
+}
+
+// MaintenancePolicyConfigAudit is a configuration change log entry.
+type MaintenancePolicyConfigAudit struct {
+	ID          string         `json:"id"`
+	PolicyID    string         `json:"policy_id,omitempty"`
+	ActorPrefix string         `json:"actor_prefix"`
+	Action      string         `json:"action"`
+	Before      map[string]any `json:"before,omitempty"`
+	After       map[string]any `json:"after,omitempty"`
+	CreatedAt   time.Time      `json:"created_at"`
+}
+
+// ValidVacuumStrategy reports whether s is an allowed vacuum_strategy value.
+func ValidVacuumStrategy(s string) bool {
+	switch strings.TrimSpace(s) {
+	case VacuumStrategyNone, VacuumStrategyVacuum, VacuumStrategyAnalyze,
+		VacuumStrategyVacuumAnalyze, VacuumStrategyReindex:
+		return true
+	default:
+		return false
+	}
+}
+
+// NormalizeMaintenancePolicyCondition returns a safe default WHERE fragment.
+func NormalizeMaintenancePolicyCondition(condition string) string {
+	c := strings.TrimSpace(condition)
+	if c == "" {
+		return "true"
+	}
+	return c
+}
+
+// ValidateMaintenancePolicyInput checks required fields for create/update payloads.
+func ValidateMaintenancePolicyInput(name, tableName, vacuumStrategy, schedule string) error {
+	if strings.TrimSpace(name) == "" || strings.TrimSpace(tableName) == "" || strings.TrimSpace(schedule) == "" {
+		return ErrInvalidInput
+	}
+	if !ValidVacuumStrategy(vacuumStrategy) {
+		return ErrInvalidInput
+	}
+	return nil
+}