update tables primary key to use serial/integer

internal/db/migrations/00001_create_users_table.sql

@@ -1,7 +1,7 @@
 -- +goose Up
 -- +goose StatementBegin
 CREATE TABLE IF NOT EXISTS users (
-    id TEXT PRIMARY KEY,
+    id SERIAL PRIMARY KEY NOT NULL,
     email TEXT UNIQUE NOT NULL,
     password_hash TEXT NULL, -- Allow null for passwordless login
     pending_email TEXT NULL, -- Store new email when changing email

internal/db/migrations/00002_create_tokens_table.sql

@@ -1,8 +1,8 @@
 -- +goose Up
 -- +goose StatementBegin
 CREATE TABLE IF NOT EXISTS tokens (
-    id TEXT PRIMARY KEY,
-    user_id TEXT NOT NULL,
+    id SERIAL PRIMARY KEY NOT NULL,
+    user_id INTEGER NOT NULL,
     type TEXT NOT NULL,
     token TEXT UNIQUE NOT NULL,
     expires_at TIMESTAMP NOT NULL,

internal/db/migrations/00003_create_profiles_table.sql

@@ -1,8 +1,8 @@
 -- +goose Up
 -- +goose StatementBegin
 CREATE TABLE IF NOT EXISTS profiles (
-    id TEXT PRIMARY KEY,
-    user_id TEXT UNIQUE NOT NULL,
+    id SERIAL PRIMARY KEY NOT NULL,
+    user_id INTEGER UNIQUE NOT NULL,
     name TEXT NOT NULL,
     created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,
     updated_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP,

internal/db/migrations/00004_create_files_table.sql

@@ -1,8 +1,8 @@
 -- +goose Up
 -- +goose StatementBegin
 CREATE TABLE IF NOT EXISTS files (
-    id TEXT PRIMARY KEY,
-    user_id TEXT NOT NULL,
+    id SERIAL PRIMARY KEY NOT NULL,
+    user_id INTEGER NOT NULL,
     owner_type TEXT NOT NULL,
     owner_id TEXT NOT NULL,
     type TEXT NOT NULL,