Adopt sqlc for typed Postgres queries behind store entities.

db/queries/answers.sql

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+-- name: UpsertAnswer :exec
+INSERT INTO answers (question_id, author_id, body, created_at, updated_at)
+VALUES ($1, $2, $3, $4, $5)
+ON CONFLICT (question_id) DO UPDATE
+SET body = excluded.body, author_id = excluded.author_id, updated_at = excluded.updated_at;
+
+-- name: GetAnswer :one
+SELECT a.question_id, a.author_id, u.name AS author_name, a.body, a.created_at, a.updated_at
+FROM answers a
+JOIN users u ON u.id = a.author_id
+WHERE a.question_id = $1;

db/queries/questions.sql

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+-- name: CreateQuestion :exec
+INSERT INTO questions (id, author_id, title, body, city, hunt_date, hidden, created_at)
+VALUES ($1, $2, $3, $4, $5, $6, 0, $7);
+
+-- name: HideQuestion :exec
+UPDATE questions
+SET hidden = 1
+WHERE id = $1;
+
+-- name: ListHunt :many
+SELECT q.id, q.author_id, u.name AS author_name, q.title, q.body, q.city, q.hunt_date, q.hidden, q.created_at,
+       COALESCE(SUM(v.value), 0)::bigint AS score,
+       CASE WHEN a.question_id IS NULL THEN 0 ELSE 1 END::bigint AS answered,
+       COALESCE((
+         SELECT votes.value FROM votes
+         WHERE votes.user_id = sqlc.arg(viewer_id) AND votes.question_id = q.id
+       ), 0)::bigint AS user_vote
+FROM questions q
+JOIN users u ON u.id = q.author_id
+LEFT JOIN votes v ON v.question_id = q.id
+LEFT JOIN answers a ON a.question_id = q.id
+WHERE q.hunt_date = sqlc.arg(hunt_date) AND q.hidden = 0
+GROUP BY q.id, q.author_id, u.name, q.title, q.body, q.city, q.hunt_date, q.hidden, q.created_at, a.question_id
+ORDER BY score DESC, q.created_at ASC;
+
+-- name: GetQuestion :one
+SELECT q.id, q.author_id, u.name AS author_name, q.title, q.body, q.city, q.hunt_date, q.hidden, q.created_at,
+       COALESCE((SELECT SUM(votes.value) FROM votes WHERE votes.question_id = q.id), 0)::bigint AS score,
+       CASE WHEN a.question_id IS NULL THEN 0 ELSE 1 END::bigint AS answered,
+       COALESCE((
+         SELECT votes.value FROM votes
+         WHERE votes.user_id = sqlc.arg(viewer_id) AND votes.question_id = q.id
+       ), 0)::bigint AS user_vote
+FROM questions q
+JOIN users u ON u.id = q.author_id
+LEFT JOIN answers a ON a.question_id = q.id
+WHERE q.id = sqlc.arg(id);
+
+-- name: ListQuestionsByAuthor :many
+SELECT q.id, q.author_id, u.name AS author_name, q.title, q.body, q.city, q.hunt_date, q.hidden, q.created_at,
+       COALESCE((SELECT SUM(votes.value) FROM votes WHERE votes.question_id = q.id), 0)::bigint AS score,
+       CASE WHEN a.question_id IS NULL THEN 0 ELSE 1 END::bigint AS answered,
+       0::bigint AS user_vote
+FROM questions q
+JOIN users u ON u.id = q.author_id
+LEFT JOIN answers a ON a.question_id = q.id
+WHERE q.author_id = sqlc.arg(author_id) AND q.hidden = 0
+ORDER BY q.created_at DESC;
+
+-- name: ListQuestionsAnsweredBy :many
+SELECT q.id, q.author_id, u.name AS author_name, q.title, q.body, q.city, q.hunt_date, q.hidden, q.created_at,
+       COALESCE((SELECT SUM(votes.value) FROM votes WHERE votes.question_id = q.id), 0)::bigint AS score,
+       1::bigint AS answered,
+       0::bigint AS user_vote
+FROM answers ans
+JOIN questions q ON q.id = ans.question_id
+JOIN users u ON u.id = q.author_id
+WHERE ans.author_id = sqlc.arg(admin_id) AND q.hidden = 0
+ORDER BY ans.updated_at DESC;

db/queries/users.sql

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+-- name: CreateUser :exec
+INSERT INTO users (id, username, name, password_hash, role, avatar_url, state, created_at)
+VALUES ($1, $2, $3, $4, $5, '', '', $6);
+
+-- name: GetUserByID :one
+SELECT id, username, name, role, avatar_url, state, created_at
+FROM users
+WHERE id = $1;
+
+-- name: GetUserByUsername :one
+SELECT id, username, name, role, avatar_url, state, created_at, password_hash
+FROM users
+WHERE username = $1;
+
+-- name: ListUsers :many
+SELECT id, username, name, role, avatar_url, state, created_at
+FROM users
+ORDER BY created_at ASC;
+
+-- name: CountAdmins :one
+SELECT COUNT(*)::bigint AS count
+FROM users
+WHERE role = $1;
+
+-- name: GetUserRole :one
+SELECT role
+FROM users
+WHERE id = $1;
+
+-- name: UpdateUserRole :execresult
+UPDATE users
+SET role = $1
+WHERE id = $2;
+
+-- name: UpdateUserState :exec
+UPDATE users
+SET state = $1
+WHERE id = $2;
+
+-- name: UpdateUserStateAndAvatar :exec
+UPDATE users
+SET state = $1, avatar_url = $2
+WHERE id = $3;

db/queries/votes.sql

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+-- name: GetVote :one
+SELECT value
+FROM votes
+WHERE user_id = $1 AND question_id = $2;
+
+-- name: DeleteVote :exec
+DELETE FROM votes
+WHERE user_id = $1 AND question_id = $2;
+
+-- name: UpsertVote :exec
+INSERT INTO votes (user_id, question_id, value)
+VALUES ($1, $2, $3)
+ON CONFLICT (user_id, question_id) DO UPDATE
+SET value = excluded.value;