🗃️ feat: 新增 thread db table 和模型

src/database/server/migrations/0011_strange_blade.sql

@@ -0,0 +1,39 @@
+CREATE TABLE IF NOT EXISTS "threads" (
+	"id" text PRIMARY KEY NOT NULL,
+	"title" text,
+	"type" text NOT NULL,
+	"status" text DEFAULT 'active',
+	"topic_id" text NOT NULL,
+	"source_message_id" text NOT NULL,
+	"parent_thread_id" text,
+	"source_preview" text,
+	"user_id" text NOT NULL,
+	"last_active_at" timestamp with time zone DEFAULT now(),
+	"accessed_at" timestamp with time zone DEFAULT now() NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
+	"updated_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+DO $$ BEGIN
+ ALTER TABLE "threads" ADD CONSTRAINT "threads_topic_id_topics_id_fk" FOREIGN KEY ("topic_id") REFERENCES "public"."topics"("id") ON DELETE cascade ON UPDATE no action;
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;
+--> statement-breakpoint
+DO $$ BEGIN
+ ALTER TABLE "threads" ADD CONSTRAINT "threads_source_message_id_messages_id_fk" FOREIGN KEY ("source_message_id") REFERENCES "public"."messages"("id") ON DELETE set null ON UPDATE no action;
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;
+--> statement-breakpoint
+DO $$ BEGIN
+ ALTER TABLE "threads" ADD CONSTRAINT "threads_parent_thread_id_threads_id_fk" FOREIGN KEY ("parent_thread_id") REFERENCES "public"."threads"("id") ON DELETE set null ON UPDATE no action;
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;
+--> statement-breakpoint
+DO $$ BEGIN
+ ALTER TABLE "threads" ADD CONSTRAINT "threads_user_id_users_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."users"("id") ON DELETE cascade ON UPDATE no action;
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;