feat: implement service history view and tracking

internal/models/models.go

@@ -4,10 +4,10 @@ import "time"
 
 // Service represents a microservice that can be locked.
 type Service struct {
-	Name      string    `json:"name"`
-	IsLocked  bool      `json:"is_locked"`
-	LockedBy  string    `json:"locked_by,omitempty"`
-	LockedAt  time.Time `json:"locked_at,omitempty"`
+	Name     string    `json:"name"`
+	IsLocked bool      `json:"is_locked"`
+	LockedBy string    `json:"locked_by,omitempty"`
+	LockedAt time.Time `json:"locked_at,omitempty"`
 }
 
 // LockRequest is the payload to lock a service.
@@ -21,3 +21,11 @@ type UnlockRequest struct {
 	ServiceName string `json:"service_name"`
 	User        string `json:"user"`
 }
+
+// HistoryEntry represents a historical event for a service.
+type HistoryEntry struct {
+	ServiceName string    `json:"service_name"`
+	Action      string    `json:"action"` // "LOCK" or "UNLOCK"
+	User        string    `json:"user"`
+	Timestamp   time.Time `json:"timestamp"`
+}