M1/#292: user queries (create + lookup by username/token + count)

internal/db/queries/users.sql

@@ -0,0 +1,13 @@
+-- name: CreateUser :one
+INSERT INTO users (username, password_hash, api_token, is_admin)
+VALUES ($1, $2, $3, $4)
+RETURNING *;
+
+-- name: GetUserByUsername :one
+SELECT * FROM users WHERE username = $1;
+
+-- name: GetUserByAPIToken :one
+SELECT * FROM users WHERE api_token = $1;
+
+-- name: CountUsers :one
+SELECT count(*) FROM users;