feat: sqlc, nix formatting

server/db/queries/user.sql

@@ -0,0 +1,46 @@
+-- name: GetUser :one
+SELECT
+    id,
+    username,
+    password,
+    profile_picture_id
+FROM user
+WHERE
+    id = @id
+LIMIT 1;
+
+-- name: GetUserbyUsername :one
+SELECT
+    id,
+    username,
+    password,
+    profile_picture_id
+FROM user
+WHERE
+    username = @username
+LIMIT 1;
+
+-- name: InsertUser :one
+INSERT INTO user (
+    username,
+    password
+) VALUES (
+    @username,
+    @password
+)
+RETURNING id;
+
+-- name: UpdateUser :exec
+UPDATE user
+SET
+    username = COALESCE(sqlc.narg('username'), username),
+    password = COALESCE(sqlc.narg('password'), password),
+    profile_picture_id = COALESCE(
+        sqlc.narg('profile_picture_id'),
+        profile_picture_id
+    )
+WHERE id = @id;
+
+-- name: DeleteUser :exec
+DELETE FROM user
+WHERE id = @id;