sqldb: add table to track custom SQL migrations

This commit adds the migration_tracker table which we'll use to track if
a custom migration has already been done.

sqldb/sqlc/migration.sql.go

@@ -0,0 +1,60 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.25.0
+// source: migration.sql
+
+package sqlc
+
+import (
+	"context"
+	"time"
+)
+
+const getDatabaseVersion = `-- name: GetDatabaseVersion :one
+SELECT
+  version
+FROM
+  migration_tracker
+ORDER BY
+  version DESC
+LIMIT 1
+`
+
+func (q *Queries) GetDatabaseVersion(ctx context.Context) (int32, error) {
+	row := q.db.QueryRowContext(ctx, getDatabaseVersion)
+	var version int32
+	err := row.Scan(&version)
+	return version, err
+}
+
+const getMigration = `-- name: GetMigration :one
+SELECT
+  migration_time
+FROM
+  migration_tracker
+WHERE
+  version = $1
+`
+
+func (q *Queries) GetMigration(ctx context.Context, version int32) (time.Time, error) {
+	row := q.db.QueryRowContext(ctx, getMigration, version)
+	var migration_time time.Time
+	err := row.Scan(&migration_time)
+	return migration_time, err
+}
+
+const setMigration = `-- name: SetMigration :exec
+INSERT INTO
+  migration_tracker (version, migration_time) 
+VALUES ($1, $2)
+`
+
+type SetMigrationParams struct {
+	Version       int32
+	MigrationTime time.Time
+}
+
+func (q *Queries) SetMigration(ctx context.Context, arg SetMigrationParams) error {
+	_, err := q.db.ExecContext(ctx, setMigration, arg.Version, arg.MigrationTime)
+	return err
+}