Reduce minimum tx level for balance-related queries

Author: Jeff Yanta

pkg/code/data/action/postgres/model.go

@@ -233,7 +233,7 @@ func dbGetNetBalance(ctx context.Context, db *sqlx.DB, account string) (int64, e
 		(SELECT COALESCE(SUM(quantity), 0) FROM ` + tableName + ` WHERE destination = $1 AND state != $2) -
 		(SELECT COALESCE(SUM(quantity), 0) FROM ` + tableName + ` WHERE source = $1 AND state != $2);`
 
-	err := pgutil.ExecuteInTx(ctx, db, sql.LevelRepeatableRead, func(tx *sqlx.Tx) error {
+	err := pgutil.ExecuteInTx(ctx, db, sql.LevelDefault, func(tx *sqlx.Tx) error {
 		return tx.GetContext(
 			ctx,
 			&res,
@@ -275,7 +275,7 @@ func dbGetNetBalanceBatch(ctx context.Context, db *sqlx.DB, accounts ...string)
 		(SELECT source AS account, -COALESCE(SUM(quantity), 0) AS net_balance FROM `+tableName+` WHERE source IN (%s) AND state != $1 GROUP BY source);`,
 		accountFilter, accountFilter,
 	)
-	err := pgutil.ExecuteInTx(ctx, db, sql.LevelRepeatableRead, func(tx *sqlx.Tx) error {
+	err := pgutil.ExecuteInTx(ctx, db, sql.LevelDefault, func(tx *sqlx.Tx) error {
 		return tx.SelectContext(
 			ctx,
 			&rows,

pkg/code/data/deposit/postgres/model.go

@@ -116,7 +116,7 @@ func dbGetQuarkAmount(ctx context.Context, db *sqlx.DB, account string) (uint64,
 		WHERE destination = $1 AND confirmation_state = $2
 	`
 
-	err := pgutil.ExecuteInTx(ctx, db, sql.LevelRepeatableRead, func(tx *sqlx.Tx) error {
+	err := pgutil.ExecuteInTx(ctx, db, sql.LevelDefault, func(tx *sqlx.Tx) error {
 		return db.GetContext(ctx, &res, query, account, transaction.ConfirmationFinalized)
 	})
 	if err != nil {
@@ -151,7 +151,7 @@ func dbGetQuarkAmountBatch(ctx context.Context, db *sqlx.DB, accounts ...string)
 		GROUP BY destination
 	`, accountFilter)
 
-	err := pgutil.ExecuteInTx(ctx, db, sql.LevelRepeatableRead, func(tx *sqlx.Tx) error {
+	err := pgutil.ExecuteInTx(ctx, db, sql.LevelDefault, func(tx *sqlx.Tx) error {
 		return tx.SelectContext(ctx, &rows, query, transaction.ConfirmationFinalized)
 	})
 	if err != nil {
@@ -175,7 +175,7 @@ func dbGetUsdAmount(ctx context.Context, db *sqlx.DB, account string) (float64,
 		WHERE destination = $1 AND confirmation_state = $2
 	`
 
-	err := pgutil.ExecuteInTx(ctx, db, sql.LevelRepeatableRead, func(tx *sqlx.Tx) error {
+	err := pgutil.ExecuteInTx(ctx, db, sql.LevelDefault, func(tx *sqlx.Tx) error {
 		return db.GetContext(ctx, &res, query, account, transaction.ConfirmationFinalized)
 	})
 	if err != nil {