feat: add admin log deletion

internal/api/log_handler.go

@@ -161,6 +161,62 @@ type LogStatsResponse struct {
 	ByStatus   map[string]int64 `json:"by_status"`
 }
 
+type DeleteLogsRequest struct {
+	Before string `json:"before"`
+	KeyID  uint   `json:"key_id"`
+	Model  string `json:"model"`
+}
+
+type DeleteLogsResponse struct {
+	DeletedCount int64 `json:"deleted_count"`
+}
+
+// DeleteLogs godoc
+// @Summary      Delete logs (admin)
+// @Description  Delete logs before a given timestamp with optional filters
+// @Tags         admin
+// @Accept       json
+// @Produce      json
+// @Security     AdminAuth
+// @Param        request  body      DeleteLogsRequest  true  "Delete filters"
+// @Success      200      {object}  DeleteLogsResponse
+// @Failure      400      {object}  gin.H
+// @Failure      500      {object}  gin.H
+// @Router       /admin/logs [delete]
+func (h *Handler) DeleteLogs(c *gin.Context) {
+	var req DeleteLogsRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid request body"})
+		return
+	}
+
+	before := strings.TrimSpace(req.Before)
+	if before == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "before is required"})
+		return
+	}
+	ts, err := time.Parse(time.RFC3339, before)
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid before time"})
+		return
+	}
+
+	q := h.db.Unscoped().Where("created_at < ?", ts.UTC())
+	if req.KeyID > 0 {
+		q = q.Where("key_id = ?", req.KeyID)
+	}
+	if model := strings.TrimSpace(req.Model); model != "" {
+		q = q.Where("model_name = ?", model)
+	}
+
+	res := q.Delete(&model.LogRecord{})
+	if res.Error != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to delete logs", "details": res.Error.Error()})
+		return
+	}
+	c.JSON(http.StatusOK, DeleteLogsResponse{DeletedCount: res.RowsAffected})
+}
+
 // LogStats godoc
 // @Summary      Log stats (admin)
 // @Description  Aggregate log stats with basic filtering