feat: Add database maintenance with backup/reset modes and triggers

1 files changed, 18 insertions, 2 deletions

diff --git a/internal/config/config.go b/internal/config/config.go
index f97add5..250827b 100644
--- a/internal/config/config.go
+++ b/internal/config/config.go
@@ -73,8 +73,24 @@ type ServerConfig struct {
 
 // StorageConfig contains database settings
 type StorageConfig struct {
-	Path        string `yaml:"path"`
-	HistoryDays int    `yaml:"history_days"`
+	Path        string            `yaml:"path"`
+	HistoryDays int               `yaml:"history_days"`
+	Maintenance MaintenanceConfig `yaml:"maintenance,omitempty"`
+}
+
+// MaintenanceConfig controls database maintenance/pruning behavior
+type MaintenanceConfig struct {
+	// Mode: "never" (default), "backup" (rename with epoch suffix), "reset" (delete in place)
+	Mode     string              `yaml:"mode,omitempty"`
+	Triggers MaintenanceTriggers `yaml:"triggers,omitempty"`
+}
+
+// MaintenanceTriggers defines when maintenance should occur (OR'd together)
+type MaintenanceTriggers struct {
+	Size   string `yaml:"size,omitempty"`   // e.g., "100MB", "1GB"
+	Checks int64  `yaml:"checks,omitempty"` // total check count threshold
+	Cron   string `yaml:"cron,omitempty"`   // cron expression, e.g., "0 3 * * 0"
+	Daily  string `yaml:"daily,omitempty"`  // daily time, e.g., "03:00"
 }
 
 // GroupConfig represents a group of monitors