add sqlite support

cmd/background/config.go

@@ -8,10 +8,20 @@ import (
 	"git.loyso.art/frx/kurious/internal/common/config"
 )
 
+type dbEngine string
+
+const (
+	DBEngineUnknown dbEngine = ""
+	DBEngineYDB     dbEngine = "ydb"
+	DBEngineSqlite  dbEngine = "sqlite"
+)
+
 type Config struct {
-	Log            config.Log `json:"log"`
-	YDB            config.YDB `json:"ydb"`
-	SyncSravniCron string     `json:"sync_sravni_cron"`
+	Log            config.Log    `json:"log"`
+	YDB            config.YDB    `json:"ydb"`
+	Sqlite         config.Sqlite `json:"sqlite"`
+	DBEngine       dbEngine      `json:"db_engine"`
+	SyncSravniCron string        `json:"sync_sravni_cron"`
 
 	DebugHTTP bool `json:"debug_http"`
 }
@@ -37,5 +47,7 @@ func defaultConfig() Config {
 			Level:  config.LogLevelInfo,
 			Format: config.LogFormatText,
 		},
+		// TODO: change to sqlite once it proven to be working
+		DBEngine: DBEngineYDB,
 	}
 }