CREATE TABLE "chat_message_mutations" (
	"id" uuid PRIMARY KEY DEFAULT gen_random_uuid() NOT NULL,
	"workspace_id" uuid NOT NULL,
	"channel_id" uuid NOT NULL,
	"message_id" uuid NOT NULL,
	"mutation_sequence" bigint NOT NULL,
	"revision" integer NOT NULL,
	"kind" varchar(16) NOT NULL,
	"created_at" timestamp with time zone DEFAULT now() NOT NULL,
	CONSTRAINT "chat_message_mutations_channel_sequence_unique" UNIQUE("workspace_id","channel_id","mutation_sequence"),
	CONSTRAINT "chat_message_mutations_revision_check" CHECK ("chat_message_mutations"."revision" > 1)
);
--> statement-breakpoint
ALTER TABLE "chat_channels" ADD COLUMN "next_mutation_sequence" bigint DEFAULT 1 NOT NULL;--> statement-breakpoint
ALTER TABLE "chat_message_mutations" ADD CONSTRAINT "chat_message_mutations_workspace_id_workspaces_id_fk" FOREIGN KEY ("workspace_id") REFERENCES "public"."workspaces"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
ALTER TABLE "chat_message_mutations" ADD CONSTRAINT "chat_message_mutations_channel_fk" FOREIGN KEY ("workspace_id","channel_id") REFERENCES "public"."chat_channels"("workspace_id","id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
ALTER TABLE "chat_message_mutations" ADD CONSTRAINT "chat_message_mutations_message_fk" FOREIGN KEY ("workspace_id","message_id") REFERENCES "public"."chat_messages"("workspace_id","id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
CREATE INDEX "chat_message_mutations_workspace_id_idx" ON "chat_message_mutations" USING btree ("workspace_id");