add regenerate endpoint

server/handler/snapshotRegenerateHourly.go

@@ -0,0 +1,68 @@
+package handler
+
+import (
+	"encoding/json"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+	"vctp/internal/report"
+)
+
+// SnapshotRegenerateHourlyReports regenerates missing hourly snapshot XLSX reports on disk.
+// @Summary Regenerate hourly snapshot reports
+// @Description Regenerates XLSX reports for hourly snapshots when the report files are missing or empty.
+// @Tags snapshots
+// @Produce json
+// @Success 200 {object} map[string]interface{} "Regeneration summary"
+// @Failure 500 {object} map[string]string "Server error"
+// @Router /api/snapshots/regenerate-hourly-reports [post]
+func (h *Handler) SnapshotRegenerateHourlyReports(w http.ResponseWriter, r *http.Request) {
+	ctx := r.Context()
+	reportsDir := strings.TrimSpace(h.Settings.Values.Settings.ReportsDir)
+	if reportsDir == "" {
+		reportsDir = "/var/lib/vctp/reports"
+	}
+	if err := os.MkdirAll(reportsDir, 0o755); err != nil {
+		h.Logger.Error("failed to create reports directory", "error", err, "path", reportsDir)
+		writeJSONError(w, http.StatusInternalServerError, "failed to create reports directory")
+		return
+	}
+
+	start := time.Unix(0, 0)
+	end := time.Now().AddDate(10, 0, 0) // sufficiently in the future to include all records
+	records, err := report.SnapshotRecordsWithFallback(ctx, h.Database, "hourly", "inventory_hourly_", "epoch", start, end)
+	if err != nil {
+		h.Logger.Error("failed to list hourly snapshots", "error", err)
+		writeJSONError(w, http.StatusInternalServerError, "failed to list hourly snapshots")
+		return
+	}
+
+	var regenerated, skipped, errors int
+	for _, rec := range records {
+		dest := filepath.Join(reportsDir, rec.TableName+".xlsx")
+		if info, err := os.Stat(dest); err == nil && info.Size() > 0 {
+			skipped++
+			continue
+		}
+		if _, err := report.SaveTableReport(h.Logger, h.Database, ctx, rec.TableName, reportsDir); err != nil {
+			errors++
+			h.Logger.Warn("failed to regenerate hourly report", "table", rec.TableName, "error", err)
+			continue
+		}
+		regenerated++
+	}
+
+	resp := map[string]interface{}{
+		"status":       "OK",
+		"total":        len(records),
+		"regenerated":  regenerated,
+		"skipped":      skipped,
+		"errors":       errors,
+		"reports_dir":  reportsDir,
+		"snapshotType": "hourly",
+	}
+	w.Header().Set("Content-Type", "application/json")
+	json.NewEncoder(w).Encode(resp)
+}