[#1187] added Dao query semaphore and base fail/retry

core/db_cgo.go

@@ -24,7 +24,7 @@ func connectDB(dbPath string) (*dbx.DB, error) {
 	// use a fixed connection pool to limit the SQLITE_BUSY errors
 	// and reduce the open file descriptors
 	// (the limits are arbitrary and may change in the future)
-	db.DB().SetMaxOpenConns(1000)
+	db.DB().SetMaxOpenConns(800)
 	db.DB().SetMaxIdleConns(30)
 	db.DB().SetConnMaxIdleTime(5 * time.Minute)
 

core/db_nocgo.go

@@ -26,7 +26,7 @@ func connectDB(dbPath string) (*dbx.DB, error) {
 	// (the limits are arbitrary and may change in the future)
 	//
 	// @see https://gitlab.com/cznic/sqlite/-/issues/115
-	db.DB().SetMaxOpenConns(1000)
+	db.DB().SetMaxOpenConns(800)
 	db.DB().SetMaxIdleConns(30)
 	db.DB().SetConnMaxIdleTime(5 * time.Minute)