ensure we dont collect hourly snapshot too soon after startup

internal/tasks/inventorySnapshots.go

@@ -51,6 +51,30 @@ func (c *CronTask) RunVcenterSnapshotHourly(ctx context.Context, logger *slog.Lo
 		logger.Info("Hourly snapshot job finished", "duration", time.Since(startedAt))
 	}()
 	startTime := time.Now()
+
+	// reload settings in case vcenter list has changed
+	c.Settings.ReadYMLSettings()
+
+	if c.FirstHourlySnapshotCheck {
+		if err := report.EnsureSnapshotRegistry(ctx, c.Database); err != nil {
+			return err
+		}
+		lastSnapshot, err := report.LatestSnapshotTime(ctx, c.Database, "hourly")
+		if err != nil {
+			return err
+		}
+		minIntervalSeconds := intWithDefault(c.Settings.Values.Settings.VcenterInventorySnapshotSeconds, 3600)
+		if !lastSnapshot.IsZero() && startTime.Sub(lastSnapshot) < time.Duration(minIntervalSeconds)*time.Second {
+			c.Logger.Info("Skipping hourly snapshot, last snapshot too recent",
+				"last_snapshot", lastSnapshot,
+				"min_interval_seconds", minIntervalSeconds,
+			)
+			c.FirstHourlySnapshotCheck = false
+			return nil
+		}
+		c.FirstHourlySnapshotCheck = false
+	}
+
 	tableName, err := hourlyInventoryTableName(startTime)
 	if err != nil {
 		return err
@@ -60,16 +84,10 @@ func (c *CronTask) RunVcenterSnapshotHourly(ctx context.Context, logger *slog.Lo
 	if err := ensureDailyInventoryTable(ctx, dbConn, tableName); err != nil {
 		return err
 	}
-	if err := report.EnsureSnapshotRegistry(ctx, c.Database); err != nil {
-		return err
-	}
 	if err := report.RegisterSnapshot(ctx, c.Database, "hourly", tableName, startTime); err != nil {
 		c.Logger.Warn("failed to register hourly snapshot", "error", err, "table", tableName)
 	}
 
-	// reload settings in case vcenter list has changed
-	c.Settings.ReadYMLSettings()
-
 	var wg sync.WaitGroup
 	var errCount int64
 	concurrencyLimit := c.Settings.Values.Settings.HourlySnapshotConcurrency

internal/tasks/tasks.go

@@ -9,8 +9,9 @@ import (
 
 // CronTask stores runtime information to be used by tasks
 type CronTask struct {
-	Logger   *slog.Logger
-	Database db.Database
-	Settings *settings.Settings
-	VcCreds  *vcenter.VcenterLogin
+	Logger                   *slog.Logger
+	Database                 db.Database
+	Settings                 *settings.Settings
+	VcCreds                  *vcenter.VcenterLogin
+	FirstHourlySnapshotCheck bool
 }