add diagnostic endpoint

server/handler/dailyCreationDiagnostics.go

@@ -0,0 +1,150 @@
+package handler
+
+import (
+	"context"
+	"database/sql"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"strings"
+	"time"
+	"vctp/db"
+	"vctp/server/models"
+)
+
+// DailyCreationDiagnostics returns missing CreationTime diagnostics for a daily summary table.
+// @Summary Daily summary CreationTime diagnostics
+// @Description Returns counts of daily summary rows missing CreationTime and sample rows for the given date.
+// @Tags diagnostics
+// @Produce json
+// @Param date query string true "Daily date (YYYY-MM-DD)"
+// @Success 200 {object} models.DailyCreationDiagnosticsResponse "Diagnostics result"
+// @Failure 400 {object} models.ErrorResponse "Invalid request"
+// @Failure 404 {object} models.ErrorResponse "Summary not found"
+// @Failure 500 {object} models.ErrorResponse "Server error"
+// @Router /api/diagnostics/daily-creation [get]
+func (h *Handler) DailyCreationDiagnostics(w http.ResponseWriter, r *http.Request) {
+	dateValue := strings.TrimSpace(r.URL.Query().Get("date"))
+	if dateValue == "" {
+		writeJSONError(w, http.StatusBadRequest, "date is required")
+		return
+	}
+
+	loc := time.Now().Location()
+	parsed, err := time.ParseInLocation("2006-01-02", dateValue, loc)
+	if err != nil {
+		writeJSONError(w, http.StatusBadRequest, "date must be YYYY-MM-DD")
+		return
+	}
+
+	tableName := fmt.Sprintf("inventory_daily_summary_%s", parsed.Format("20060102"))
+	if _, err := db.SafeTableName(tableName); err != nil {
+		writeJSONError(w, http.StatusBadRequest, "invalid summary table name")
+		return
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	dbConn := h.Database.DB()
+	if !db.TableExists(ctx, dbConn, tableName) {
+		writeJSONError(w, http.StatusNotFound, "daily summary table not found")
+		return
+	}
+
+	var totalRows int64
+	countQuery := fmt.Sprintf(`SELECT COUNT(*) FROM %s`, tableName)
+	if err := dbConn.GetContext(ctx, &totalRows, countQuery); err != nil {
+		h.Logger.Warn("daily creation diagnostics count failed", "table", tableName, "error", err)
+		writeJSONError(w, http.StatusInternalServerError, "failed to read summary rows")
+		return
+	}
+
+	var missingTotal int64
+	missingQuery := fmt.Sprintf(`SELECT COUNT(*) FROM %s WHERE "CreationTime" IS NULL OR "CreationTime" = 0`, tableName)
+	if err := dbConn.GetContext(ctx, &missingTotal, missingQuery); err != nil {
+		h.Logger.Warn("daily creation diagnostics missing count failed", "table", tableName, "error", err)
+		writeJSONError(w, http.StatusInternalServerError, "failed to read missing creation rows")
+		return
+	}
+
+	missingPct := 0.0
+	if totalRows > 0 {
+		missingPct = float64(missingTotal) * 100 / float64(totalRows)
+	}
+
+	byVcenter := make([]models.DailyCreationMissingByVcenter, 0)
+	byVcenterQuery := fmt.Sprintf(`
+SELECT "Vcenter", COUNT(*) AS missing_count
+FROM %s
+WHERE "CreationTime" IS NULL OR "CreationTime" = 0
+GROUP BY "Vcenter"
+ORDER BY missing_count DESC
+`, tableName)
+	if rows, err := dbConn.QueryxContext(ctx, byVcenterQuery); err != nil {
+		h.Logger.Warn("daily creation diagnostics by-vcenter failed", "table", tableName, "error", err)
+	} else {
+		for rows.Next() {
+			var vcenter string
+			var count int64
+			if err := rows.Scan(&vcenter, &count); err != nil {
+				continue
+			}
+			byVcenter = append(byVcenter, models.DailyCreationMissingByVcenter{
+				Vcenter:      vcenter,
+				MissingCount: count,
+			})
+		}
+		rows.Close()
+	}
+
+	const sampleLimit = 10
+	samples := make([]models.DailyCreationMissingSample, 0, sampleLimit)
+	sampleQuery := fmt.Sprintf(`
+SELECT "Vcenter","VmId","VmUuid","Name","SamplesPresent","AvgIsPresent","SnapshotTime"
+FROM %s
+WHERE "CreationTime" IS NULL OR "CreationTime" = 0
+ORDER BY "SamplesPresent" DESC
+LIMIT %d
+`, tableName, sampleLimit)
+	if rows, err := dbConn.QueryxContext(ctx, sampleQuery); err != nil {
+		h.Logger.Warn("daily creation diagnostics sample failed", "table", tableName, "error", err)
+	} else {
+		for rows.Next() {
+			var (
+				vcenter                      string
+				vmId, vmUuid, name           sql.NullString
+				samplesPresent, snapshotTime sql.NullInt64
+				avgIsPresent                 sql.NullFloat64
+			)
+			if err := rows.Scan(&vcenter, &vmId, &vmUuid, &name, &samplesPresent, &avgIsPresent, &snapshotTime); err != nil {
+				continue
+			}
+			samples = append(samples, models.DailyCreationMissingSample{
+				Vcenter:        vcenter,
+				VmId:           vmId.String,
+				VmUuid:         vmUuid.String,
+				Name:           name.String,
+				SamplesPresent: samplesPresent.Int64,
+				AvgIsPresent:   avgIsPresent.Float64,
+				SnapshotTime:   snapshotTime.Int64,
+			})
+		}
+		rows.Close()
+	}
+
+	response := models.DailyCreationDiagnosticsResponse{
+		Status:               "OK",
+		Date:                 parsed.Format("2006-01-02"),
+		Table:                tableName,
+		TotalRows:            totalRows,
+		MissingCreationCount: missingTotal,
+		MissingCreationPct:   missingPct,
+		MissingByVcenter:     byVcenter,
+		Samples:              samples,
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(http.StatusOK)
+	json.NewEncoder(w).Encode(response)
+}