Add homelab service and system health monitoring

store.go

@@ -104,6 +104,19 @@ func openStore(path string) (*Store, error) {
 			acknowledged_at INTEGER, email_sent_at INTEGER
 		)`,
 		`CREATE INDEX IF NOT EXISTS alert_events_active_idx ON alert_events(alert_key,resolved_at)`,
+		`CREATE TABLE IF NOT EXISTS services (
+			id INTEGER PRIMARY KEY AUTOINCREMENT, name TEXT NOT NULL, url TEXT NOT NULL,
+			local_address TEXT NOT NULL DEFAULT '', check_type TEXT NOT NULL DEFAULT 'http',
+			expected_code INTEGER NOT NULL DEFAULT 200, expected_text TEXT NOT NULL DEFAULT '',
+			timeout_seconds INTEGER NOT NULL DEFAULT 5, enabled INTEGER NOT NULL DEFAULT 1
+		)`,
+		`CREATE TABLE IF NOT EXISTS service_checks (
+			id INTEGER PRIMARY KEY AUTOINCREMENT, service_id INTEGER NOT NULL, ts INTEGER NOT NULL,
+			up INTEGER NOT NULL, latency_ms REAL NOT NULL, status_code INTEGER NOT NULL DEFAULT 0,
+			error TEXT NOT NULL DEFAULT '', tls_expiry INTEGER,
+			FOREIGN KEY(service_id) REFERENCES services(id) ON DELETE CASCADE
+		)`,
+		`CREATE INDEX IF NOT EXISTS service_checks_service_ts_idx ON service_checks(service_id,ts)`,
 	}
 	for _, statement := range statements {
 		if _, err := db.Exec(statement); err != nil {
@@ -111,6 +124,9 @@ func openStore(path string) (*Store, error) {
 			return nil, err
 		}
 	}
+	// Older databases get this column without requiring a separate migration tool.
+	_, _ = db.Exec(`ALTER TABLE alert_events ADD COLUMN recovery_sent_at INTEGER`)
+	_, _ = db.Exec(`PRAGMA foreign_keys=ON`)
 	return &Store{db: db}, nil
 }
 
@@ -138,7 +154,7 @@ func (s *Store) SaveThresholds(value AlertThresholds) error {
 }
 
 func defaultEmailSettings() EmailSettings {
-	return EmailSettings{Port: 587, IntervalMinutes: 60, Severities: []string{"critical", "warning"}, Sources: []string{"CPU", "Память", "Storage", "Диски", "ZFS", "UPS", "VM/LXC", "Proxmox", "Dashboard"}}
+	return EmailSettings{Port: 587, IntervalMinutes: 60, Severities: []string{"critical", "warning"}, Sources: []string{"CPU", "Память", "Storage", "Диски", "ZFS", "UPS", "VM/LXC", "Proxmox", "Dashboard", "Сервисы", "Система", "Сеть"}}
 }
 
 func (s *Store) EmailSettings(includePassword bool) EmailSettings {