refactor: replace redis runtime and queues with sqlite-backed scheduler

src/model/mdb/transaction_lock_mdb.go

@@ -0,0 +1,18 @@
+package mdb
+
+import "time"
+
+type TransactionLock struct {
+	ID           uint64    `gorm:"column:id;primaryKey;autoIncrement" json:"id"`
+	Token        string    `gorm:"column:token;uniqueIndex:transaction_lock_token_amount_uindex,priority:1" json:"token"`
+	AmountScaled int64     `gorm:"column:amount_scaled;uniqueIndex:transaction_lock_token_amount_uindex,priority:2" json:"amount_scaled"`
+	AmountText   string    `gorm:"column:amount_text" json:"amount_text"`
+	TradeId      string    `gorm:"column:trade_id;index:transaction_lock_trade_id_index" json:"trade_id"`
+	ExpiresAt    time.Time `gorm:"column:expires_at;index:transaction_lock_expires_at_index" json:"expires_at"`
+	CreatedAt    time.Time `gorm:"column:created_at" json:"created_at"`
+	UpdatedAt    time.Time `gorm:"column:updated_at" json:"updated_at"`
+}
+
+func (t *TransactionLock) TableName() string {
+	return "transaction_lock"
+}