feat(db): add teams table and migration

apps/api/drizzle/0005_add_teams_table.sql

@@ -0,0 +1,24 @@
+-- Create teams table
+CREATE TABLE IF NOT EXISTS `teams` (
+  `id` text PRIMARY KEY NOT NULL,
+  `name` text NOT NULL,
+  `created_at` integer NOT NULL DEFAULT (unixepoch())
+);
+CREATE UNIQUE INDEX IF NOT EXISTS `teams_name_unique` ON `teams` (`name`);
+
+-- Seed Default team with a known UUID
+INSERT OR IGNORE INTO `teams` (`id`, `name`, `created_at`) VALUES ('default-team-00000000', 'Default', unixepoch());
+
+-- Migrate existing users: for each distinct team value, create a team if it doesn't exist
+INSERT OR IGNORE INTO `teams` (`id`, `name`, `created_at`)
+  SELECT lower(hex(randomblob(16))), `team`, unixepoch()
+  FROM `users`
+  WHERE `team` != 'Default'
+  GROUP BY `team`;
+
+-- Update users to reference team IDs instead of team names
+UPDATE `users` SET `team` = (
+  SELECT `id` FROM `teams` WHERE `teams`.`name` = `users`.`team`
+) WHERE EXISTS (
+  SELECT 1 FROM `teams` WHERE `teams`.`name` = `users`.`team`
+);