feat: create DB schemata for APObjects and Activities

Author: maybeanerd

backend/db/migrations/0002_messy_tomas.sql

@@ -0,0 +1,36 @@
+DO $$ BEGIN
+ CREATE TYPE "activityPubActivityType" AS ENUM('Create', 'Update', 'Delete', 'Follow', 'Like');
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;
+--> statement-breakpoint
+DO $$ BEGIN
+ CREATE TYPE "activityPubObjectType" AS ENUM('Note');
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;
+--> statement-breakpoint
+CREATE TABLE IF NOT EXISTS "activityPubActivity" (
+	"id" text PRIMARY KEY NOT NULL,
+	"receivedOn" timestamp NOT NULL,
+	"type" "activityPubActivityType" NOT NULL,
+	"actor" text NOT NULL,
+	"object" text NOT NULL
+);
+--> statement-breakpoint
+CREATE TABLE IF NOT EXISTS "activityPubObject" (
+	"id" text PRIMARY KEY NOT NULL,
+	"receivedOn" timestamp NOT NULL,
+	"type" "activityPubObjectType" NOT NULL,
+	"published" timestamp NOT NULL,
+	"attributedTo" text NOT NULL,
+	"content" text NOT NULL,
+	"inReplyTo" text,
+	"to" text DEFAULT 'https://www.w3.org/ns/activitystreams#Public' NOT NULL
+);
+--> statement-breakpoint
+DO $$ BEGIN
+ ALTER TABLE "activityPubActivity" ADD CONSTRAINT "activityPubActivity_object_activityPubObject_id_fk" FOREIGN KEY ("object") REFERENCES "activityPubObject"("id") ON DELETE no action ON UPDATE no action;
+EXCEPTION
+ WHEN duplicate_object THEN null;
+END $$;