CREATE TABLE "conversation_participants" ( "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL, "conversation_id" uuid NOT NULL, "user_id" text NOT NULL, "last_read_at" timestamp ); --> statement-breakpoint CREATE TABLE "conversations" ( "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL, "organization_id" text NOT NULL, "name" text, "is_group" boolean DEFAULT false NOT NULL, "created_by" text, "created_at" timestamp DEFAULT now() NOT NULL, "updated_at" timestamp DEFAULT now() NOT NULL ); --> statement-breakpoint CREATE TABLE "messages" ( "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL, "conversation_id" uuid NOT NULL, "sender_id" text NOT NULL, "body" text NOT NULL, "created_at" timestamp DEFAULT now() NOT NULL ); --> statement-breakpoint CREATE TABLE "notifications" ( "id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL, "organization_id" text NOT NULL, "user_id" text NOT NULL, "type" text NOT NULL, "text" text NOT NULL, "read" boolean DEFAULT false NOT NULL, "entity_type" text, "entity_id" text, "actor_name" text, "actor_initials" text, "created_at" timestamp DEFAULT now() NOT NULL ); --> statement-breakpoint ALTER TABLE "conversation_participants" ADD CONSTRAINT "conversation_participants_conversation_id_conversations_id_fk" FOREIGN KEY ("conversation_id") REFERENCES "public"."conversations"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint ALTER TABLE "conversation_participants" ADD CONSTRAINT "conversation_participants_user_id_user_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."user"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint ALTER TABLE "conversations" ADD CONSTRAINT "conversations_organization_id_organization_id_fk" FOREIGN KEY ("organization_id") REFERENCES "public"."organization"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint ALTER TABLE "conversations" ADD CONSTRAINT "conversations_created_by_user_id_fk" FOREIGN KEY ("created_by") REFERENCES "public"."user"("id") ON DELETE set null ON UPDATE no action;--> statement-breakpoint ALTER TABLE "messages" ADD CONSTRAINT "messages_conversation_id_conversations_id_fk" FOREIGN KEY ("conversation_id") REFERENCES "public"."conversations"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint ALTER TABLE "messages" ADD CONSTRAINT "messages_sender_id_user_id_fk" FOREIGN KEY ("sender_id") REFERENCES "public"."user"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint ALTER TABLE "notifications" ADD CONSTRAINT "notifications_organization_id_organization_id_fk" FOREIGN KEY ("organization_id") REFERENCES "public"."organization"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint ALTER TABLE "notifications" ADD CONSTRAINT "notifications_user_id_user_id_fk" FOREIGN KEY ("user_id") REFERENCES "public"."user"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint CREATE UNIQUE INDEX "conv_participant_uidx" ON "conversation_participants" USING btree ("conversation_id","user_id");--> statement-breakpoint CREATE INDEX "conv_participant_user_idx" ON "conversation_participants" USING btree ("user_id");--> statement-breakpoint CREATE INDEX "conversations_org_idx" ON "conversations" USING btree ("organization_id");--> statement-breakpoint CREATE INDEX "messages_conv_idx" ON "messages" USING btree ("conversation_id","created_at");--> statement-breakpoint CREATE INDEX "notifications_org_user_read_idx" ON "notifications" USING btree ("organization_id","user_id","read");