Adopt sqlc for typed Postgres queries behind store entities.

internal/store/vote.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"database/sql"
 	"fmt"
+
+	"plumber/internal/store/sqlc"
 )
 
 // Vote toggles or sets a user's vote on a question (value must be 1 or -1).
@@ -16,16 +18,20 @@ func Vote(ctx context.Context, db *sql.DB, userID, questionID string, value int)
 		return err
 	}
 	defer tx.Rollback()
-	var current sql.NullInt64
-	err = tx.QueryRowContext(ctx, `SELECT value FROM votes WHERE user_id = $1 AND question_id = $2`, userID, questionID).Scan(&current)
+
+	q := sqlc.New(tx)
+	current, err := q.GetVote(ctx, sqlc.GetVoteParams{UserID: userID, QuestionID: questionID})
 	if err != nil && err != sql.ErrNoRows {
 		return err
 	}
-	if err == nil && current.Valid && int(current.Int64) == value {
-		_, err = tx.ExecContext(ctx, `DELETE FROM votes WHERE user_id = $1 AND question_id = $2`, userID, questionID)
+	if err == nil && int(current) == value {
+		err = q.DeleteVote(ctx, sqlc.DeleteVoteParams{UserID: userID, QuestionID: questionID})
 	} else {
-		_, err = tx.ExecContext(ctx, `INSERT INTO votes (user_id, question_id, value) VALUES ($1, $2, $3)
-ON CONFLICT (user_id, question_id) DO UPDATE SET value = excluded.value`, userID, questionID, value)
+		err = q.UpsertVote(ctx, sqlc.UpsertVoteParams{
+			UserID:     userID,
+			QuestionID: questionID,
+			Value:      int32(value),
+		})
 	}
 	if err != nil {
 		return err