feat: Integrate data retention service

- Implemented the data retention service in Go (service-operation) that manages cleanup of old records based on configured retention periods. The service runs once per day to ensure outdated data is removed automatically.

server/service-operation/data-retention/handler.go

@@ -0,0 +1,59 @@
+package dataretention
+
+import (
+	"encoding/json"
+	"net/http"
+	"service-operation/pocketbase"
+)
+
+// Handler handles HTTP requests for data retention operations
+type Handler struct {
+	service *Service
+}
+
+// NewHandler creates a new data retention handler
+func NewHandler(pbClient *pocketbase.PocketBaseClient) *Handler {
+	return &Handler{
+		service: NewService(pbClient),
+	}
+}
+
+// GetSettings handles GET requests for data retention settings
+func (h *Handler) GetSettings(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	settings, err := h.service.GetDataSettings()
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(settings)
+}
+
+// TriggerCleanup handles POST requests to trigger manual cleanup
+func (h *Handler) TriggerCleanup(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodPost {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	summary, err := h.service.CleanupOldRecords()
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(summary)
+}
+
+// SetupRoutes sets up the HTTP routes for data retention
+func (h *Handler) SetupRoutes(mux *http.ServeMux) {
+	mux.HandleFunc("/data-retention/settings", h.GetSettings)
+	mux.HandleFunc("/data-retention/cleanup", h.TriggerCleanup)
+}