Make squashed baseline migrations idempotent

Use CREATE TABLE IF NOT EXISTS and CREATE UNIQUE INDEX IF NOT
EXISTS so the squashed baseline can run against actors that
already have tables from the pre-squash migration sequence.
This fixes the "table already exists" error when org workspace
actors wake up with stale migration journals.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

foundry/packages/backend/src/actors/history/db/drizzle/0000_fluffy_kid_colt.sql

@@ -1,4 +1,4 @@
-CREATE TABLE `events` (
+CREATE TABLE IF NOT EXISTS `events` (
 	`id` integer PRIMARY KEY AUTOINCREMENT NOT NULL,
 	`task_id` text,
 	`branch_name` text,

foundry/packages/backend/src/actors/project/db/drizzle/0000_useful_la_nuit.sql

@@ -1,4 +1,4 @@
-CREATE TABLE `branches` (
+CREATE TABLE IF NOT EXISTS `branches` (
 	`branch_name` text PRIMARY KEY NOT NULL,
 	`commit_sha` text NOT NULL,
 	`parent_branch` text,
@@ -11,7 +11,7 @@ CREATE TABLE `branches` (
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `pr_cache` (
+CREATE TABLE IF NOT EXISTS `pr_cache` (
 	`branch_name` text PRIMARY KEY NOT NULL,
 	`pr_number` integer NOT NULL,
 	`state` text NOT NULL,
@@ -26,13 +26,13 @@ CREATE TABLE `pr_cache` (
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `repo_meta` (
+CREATE TABLE IF NOT EXISTS `repo_meta` (
 	`id` integer PRIMARY KEY NOT NULL,
 	`remote_url` text NOT NULL,
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `task_index` (
+CREATE TABLE IF NOT EXISTS `task_index` (
 	`task_id` text PRIMARY KEY NOT NULL,
 	`branch_name` text,
 	`created_at` integer NOT NULL,

foundry/packages/backend/src/actors/sandbox-instance/db/drizzle/0000_smooth_sauron.sql

@@ -1,11 +1,11 @@
-CREATE TABLE `sandbox_instance` (
+CREATE TABLE IF NOT EXISTS `sandbox_instance` (
 	`id` integer PRIMARY KEY NOT NULL,
 	`metadata_json` text NOT NULL,
 	`status` text NOT NULL,
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `sandbox_session_events` (
+CREATE TABLE IF NOT EXISTS `sandbox_session_events` (
 	`id` text PRIMARY KEY NOT NULL,
 	`session_id` text NOT NULL,
 	`event_index` integer NOT NULL,
@@ -15,8 +15,8 @@ CREATE TABLE `sandbox_session_events` (
 	`payload_json` text NOT NULL
 );
 --> statement-breakpoint
-CREATE UNIQUE INDEX `sandbox_session_events_session_id_event_index_unique` ON `sandbox_session_events` (`session_id`,`event_index`);--> statement-breakpoint
-CREATE TABLE `sandbox_sessions` (
+CREATE UNIQUE INDEX IF NOT EXISTS `sandbox_session_events_session_id_event_index_unique` ON `sandbox_session_events` (`session_id`,`event_index`);--> statement-breakpoint
+CREATE TABLE IF NOT EXISTS `sandbox_sessions` (
 	`id` text PRIMARY KEY NOT NULL,
 	`agent` text NOT NULL,
 	`agent_session_id` text NOT NULL,

foundry/packages/backend/src/actors/task/db/drizzle/0000_charming_maestro.sql

@@ -1,4 +1,4 @@
-CREATE TABLE `task` (
+CREATE TABLE IF NOT EXISTS `task` (
 	`id` integer PRIMARY KEY NOT NULL,
 	`branch_name` text,
 	`title` text,
@@ -12,7 +12,7 @@ CREATE TABLE `task` (
 	CONSTRAINT "task_singleton_id_check" CHECK("task"."id" = 1)
 );
 --> statement-breakpoint
-CREATE TABLE `task_runtime` (
+CREATE TABLE IF NOT EXISTS `task_runtime` (
 	`id` integer PRIMARY KEY NOT NULL,
 	`active_sandbox_id` text,
 	`active_session_id` text,
@@ -23,7 +23,7 @@ CREATE TABLE `task_runtime` (
 	CONSTRAINT "task_runtime_singleton_id_check" CHECK("task_runtime"."id" = 1)
 );
 --> statement-breakpoint
-CREATE TABLE `task_sandboxes` (
+CREATE TABLE IF NOT EXISTS `task_sandboxes` (
 	`sandbox_id` text PRIMARY KEY NOT NULL,
 	`provider_id` text NOT NULL,
 	`sandbox_actor_id` text,
@@ -34,7 +34,7 @@ CREATE TABLE `task_sandboxes` (
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `task_workbench_sessions` (
+CREATE TABLE IF NOT EXISTS `task_workbench_sessions` (
 	`session_id` text PRIMARY KEY NOT NULL,
 	`session_name` text NOT NULL,
 	`model` text NOT NULL,

foundry/packages/backend/src/actors/workspace/db/drizzle/0000_melted_viper.sql

@@ -1,4 +1,4 @@
-CREATE TABLE `app_sessions` (
+CREATE TABLE IF NOT EXISTS `app_sessions` (
 	`id` text PRIMARY KEY NOT NULL,
 	`current_user_id` text,
 	`current_user_name` text,
@@ -18,7 +18,7 @@ CREATE TABLE `app_sessions` (
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `invoices` (
+CREATE TABLE IF NOT EXISTS `invoices` (
 	`id` text PRIMARY KEY NOT NULL,
 	`label` text NOT NULL,
 	`issued_at` text NOT NULL,
@@ -27,7 +27,7 @@ CREATE TABLE `invoices` (
 	`created_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `organization_members` (
+CREATE TABLE IF NOT EXISTS `organization_members` (
 	`id` text PRIMARY KEY NOT NULL,
 	`name` text NOT NULL,
 	`email` text NOT NULL,
@@ -36,7 +36,7 @@ CREATE TABLE `organization_members` (
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `organization_profile` (
+CREATE TABLE IF NOT EXISTS `organization_profile` (
 	`id` text PRIMARY KEY NOT NULL,
 	`kind` text NOT NULL,
 	`github_account_id` text NOT NULL,
@@ -67,31 +67,31 @@ CREATE TABLE `organization_profile` (
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `provider_profiles` (
+CREATE TABLE IF NOT EXISTS `provider_profiles` (
 	`provider_id` text PRIMARY KEY NOT NULL,
 	`profile_json` text NOT NULL,
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `repos` (
+CREATE TABLE IF NOT EXISTS `repos` (
 	`repo_id` text PRIMARY KEY NOT NULL,
 	`remote_url` text NOT NULL,
 	`created_at` integer NOT NULL,
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `seat_assignments` (
+CREATE TABLE IF NOT EXISTS `seat_assignments` (
 	`email` text PRIMARY KEY NOT NULL,
 	`created_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `stripe_lookup` (
+CREATE TABLE IF NOT EXISTS `stripe_lookup` (
 	`lookup_key` text PRIMARY KEY NOT NULL,
 	`organization_id` text NOT NULL,
 	`updated_at` integer NOT NULL
 );
 --> statement-breakpoint
-CREATE TABLE `task_lookup` (
+CREATE TABLE IF NOT EXISTS `task_lookup` (
 	`task_id` text PRIMARY KEY NOT NULL,
 	`repo_id` text NOT NULL
 );