init go project

internal/db/migrations/00001_create_users_table.sql

@@ -0,0 +1,21 @@
+-- +goose Up
+-- +goose StatementBegin
+CREATE TABLE IF NOT EXISTS users (
+    id TEXT PRIMARY KEY,
+    email TEXT UNIQUE NOT NULL,
+    password_hash TEXT NULL, -- Allow null for passwordless login
+    pending_email TEXT NULL, -- Store new email when changing email
+    email_verified_at TIMESTAMP NULL,
+    created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
+
+CREATE INDEX IF NOT EXISTS idx_users_email ON users(email);
+CREATE INDEX IF NOT EXISTS idx_users_passwordless ON users(id) WHERE password_hash IS NULL;
+-- +goose StatementEnd
+
+-- +goose Down
+-- +goose StatementBegin
+DROP INDEX IF EXISTS idx_users_passwordless;
+DROP INDEX IF EXISTS idx_users_email;
+DROP TABLE IF EXISTS users;
+-- +goose StatementEnd