appview: db/issues: add `ID` field to `Issue`

This will help indexing Issues faster when we introduce external search
indexer

Signed-off-by: Seongmin Lee <[e-mail]>

appview/db/issues.go

···
 )
 
 type Issue struct {
+	ID       int64
 	RepoAt   syntax.ATURI
 	OwnerDid string
 	IssueId  int
···
 
 	issue.IssueId = nextId
 
-	_, err = tx.Exec(`
+	res, err := tx.Exec(`
 		insert into issues (repo_at, owner_did, issue_id, title, body)
 		values (?, ?, ?, ?, ?)
 	`, issue.RepoAt, issue.OwnerDid, issue.IssueId, issue.Title, issue.Body)
···
 		return err
 	}
 
+	lastID, err := res.LastInsertId()
+	if err != nil {
+		return err
+	}
+	issue.ID = lastID
+
 	if err := tx.Commit(); err != nil {
 		return err
 	}
···
 		`
 		with numbered_issue as (
 			select
+				i.id,
 				i.owner_did,
 				i.issue_id,
 				i.created,
···
 				i.id, i.owner_did, i.issue_id, i.created, i.title, i.body, i.open
 		)
 		select
+			id,
 			owner_did,
 			issue_id,
 			created,
···
 		var issue Issue
 		var createdAt string
 		var metadata IssueMetadata
-		err := rows.Scan(&issue.OwnerDid, &issue.IssueId, &createdAt, &issue.Title, &issue.Body, &issue.Open, &metadata.CommentCount)
+		err := rows.Scan(&issue.ID, &issue.OwnerDid, &issue.IssueId, &createdAt, &issue.Title, &issue.Body, &issue.Open, &metadata.CommentCount)
 		if err != nil {
 			return nil, err
 		}
···
 
 	rows, err := e.Query(
 		`select
+			i.id,
 			i.owner_did,
 			i.repo_at,
 			i.issue_id,
···
 		var issueCreatedAt, repoCreatedAt string
 		var repo Repo
 		err := rows.Scan(
+			&issue.ID,
 			&issue.OwnerDid,
 			&issue.RepoAt,
 			&issue.IssueId,
···
 }
 
 func GetIssue(e Execer, repoAt syntax.ATURI, issueId int) (*Issue, error) {
-	query := `select owner_did, created, title, body, open from issues where repo_at = ? and issue_id = ?`
+	query := `select id, owner_did, created, title, body, open from issues where repo_at = ? and issue_id = ?`
 	row := e.QueryRow(query, repoAt, issueId)
 
 	var issue Issue
 	var createdAt string
-	err := row.Scan(&issue.OwnerDid, &createdAt, &issue.Title, &issue.Body, &issue.Open)
+	err := row.Scan(&issue.ID, &issue.OwnerDid, &createdAt, &issue.Title, &issue.Body, &issue.Open)
 	if err != nil {
 		return nil, err
 	}
···
 }
 
 func GetIssueWithComments(e Execer, repoAt syntax.ATURI, issueId int) (*Issue, []Comment, error) {
-	query := `select owner_did, issue_id, created, title, body, open, issue_at from issues where repo_at = ? and issue_id = ?`
+	query := `select id, owner_did, issue_id, created, title, body, open, issue_at from issues where repo_at = ? and issue_id = ?`
 	row := e.QueryRow(query, repoAt, issueId)
 
 	var issue Issue
 	var createdAt string
-	err := row.Scan(&issue.OwnerDid, &issue.IssueId, &createdAt, &issue.Title, &issue.Body, &issue.Open, &issue.IssueAt)
+	err := row.Scan(&issue.ID, &issue.OwnerDid, &issue.IssueId, &createdAt, &issue.Title, &issue.Body, &issue.Open, &issue.IssueAt)
 	if err != nil {
 		return nil, nil, err
 	}