Use INTEGER NOT NULL to follow crecto example

db/migrations/20231222134745_create_pastes.sql

@@ -1,7 +1,7 @@
 -- +micrate Up
 -- SQL in section 'Up' is executed when this migration is applied
 CREATE TABLE IF NOT EXISTS pastes (
-    id BIGSERIAL PRIMARY KEY,
+    id INTEGER NOT NULL PRIMARY KEY,
     sha256 TEXT UNIQUE NOT NULL,
     ext TEXT NOT NULL,
     mime TEXT NOT NULL,
@@ -21,4 +21,4 @@ CREATE TABLE IF NOT EXISTS pastes (
 
 -- +micrate Down
 -- SQL section 'Down' is executed when this migration is rolled back
-DROP TABLE IF EXISTS pastes;
+DROP TABLE IF EXISTS pastes;