add regenerate endpoint

internal/tasks/inventorySnapshots.go

@@ -102,6 +102,14 @@ func (c *CronTask) RunVcenterSnapshotHourly(ctx context.Context, logger *slog.Lo
 // RunVcenterDailyAggregate summarizes hourly snapshots into a daily summary table.
 func (c *CronTask) RunVcenterDailyAggregate(ctx context.Context, logger *slog.Logger) error {
 	targetTime := time.Now().Add(-time.Minute)
+	return c.aggregateDailySummary(ctx, targetTime, false)
+}
+
+func (c *CronTask) AggregateDailySummary(ctx context.Context, date time.Time, force bool) error {
+	return c.aggregateDailySummary(ctx, date, force)
+}
+
+func (c *CronTask) aggregateDailySummary(ctx context.Context, targetTime time.Time, force bool) error {
 	dayStart := time.Date(targetTime.Year(), targetTime.Month(), targetTime.Day(), 0, 0, 0, 0, targetTime.Location())
 	dayEnd := dayStart.AddDate(0, 0, 1)
 	summaryTable, err := dailySummaryTableName(targetTime)
@@ -116,6 +124,16 @@ func (c *CronTask) RunVcenterDailyAggregate(ctx context.Context, logger *slog.Lo
 	if err := report.EnsureSnapshotRegistry(ctx, c.Database); err != nil {
 		return err
 	}
+	if rowsExist, err := tableHasRows(ctx, dbConn, summaryTable); err != nil {
+		return err
+	} else if rowsExist && !force {
+		c.Logger.Debug("Daily summary already exists, skipping aggregation", "summary_table", summaryTable)
+		return nil
+	} else if rowsExist && force {
+		if err := clearTable(ctx, dbConn, summaryTable); err != nil {
+			return err
+		}
+	}
 	if rowsExist, err := tableHasRows(ctx, dbConn, summaryTable); err != nil {
 		return err
 	} else if rowsExist {
@@ -235,7 +253,14 @@ func (c *CronTask) RunVcenterMonthlyAggregate(ctx context.Context, logger *slog.
 	now := time.Now()
 	firstOfThisMonth := time.Date(now.Year(), now.Month(), 1, 0, 0, 0, 0, now.Location())
 	targetMonth := firstOfThisMonth.AddDate(0, -1, 0)
+	return c.aggregateMonthlySummary(ctx, targetMonth, false)
+}
 
+func (c *CronTask) AggregateMonthlySummary(ctx context.Context, month time.Time, force bool) error {
+	return c.aggregateMonthlySummary(ctx, month, force)
+}
+
+func (c *CronTask) aggregateMonthlySummary(ctx context.Context, targetMonth time.Time, force bool) error {
 	if err := report.EnsureSnapshotRegistry(ctx, c.Database); err != nil {
 		return err
 	}
@@ -259,6 +284,16 @@ func (c *CronTask) RunVcenterMonthlyAggregate(ctx context.Context, logger *slog.
 	if err := ensureMonthlySummaryTable(ctx, dbConn, monthlyTable); err != nil {
 		return err
 	}
+	if rowsExist, err := tableHasRows(ctx, dbConn, monthlyTable); err != nil {
+		return err
+	} else if rowsExist && !force {
+		c.Logger.Debug("Monthly summary already exists, skipping aggregation", "summary_table", monthlyTable)
+		return nil
+	} else if rowsExist && force {
+		if err := clearTable(ctx, dbConn, monthlyTable); err != nil {
+			return err
+		}
+	}
 	if rowsExist, err := tableHasRows(ctx, dbConn, monthlyTable); err != nil {
 		return err
 	} else if rowsExist {
@@ -604,6 +639,17 @@ func dropSnapshotTable(ctx context.Context, dbConn *sqlx.DB, table string) error
 	return err
 }
 
+func clearTable(ctx context.Context, dbConn *sqlx.DB, table string) error {
+	if _, err := safeTableName(table); err != nil {
+		return err
+	}
+	_, err := dbConn.ExecContext(ctx, fmt.Sprintf("DELETE FROM %s", table))
+	if err != nil {
+		return fmt.Errorf("failed to clear table %s: %w", table, err)
+	}
+	return nil
+}
+
 func tableHasRows(ctx context.Context, dbConn *sqlx.DB, table string) (bool, error) {
 	if _, err := safeTableName(table); err != nil {
 		return false, err