feat: publish threshold field on Feed model

prisma/migrations/20250506174806_add_publish_threshold_to_feed/migration.sql

@@ -0,0 +1,12 @@
+/*
+  Warnings:
+
+  - Added the required column `published_threshold` to the `Feed` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- AlterTable
+ALTER TABLE "Feed" ADD COLUMN     "message_style_id" INTEGER,
+ADD COLUMN     "published_threshold" TIMESTAMP(3) NOT NULL;
+
+-- AddForeignKey
+ALTER TABLE "Feed" ADD CONSTRAINT "Feed_message_style_id_fkey" FOREIGN KEY ("message_style_id") REFERENCES "MessageStyle"("id") ON DELETE SET NULL ON UPDATE CASCADE;

prisma/schema.prisma

@@ -23,6 +23,7 @@ model Feed {
   filters             Filter[]
   message_style       MessageStyle? @relation(fields: [message_style_id], references: [id], onDelete: SetNull)
   message_style_id    Int?
+  published_threshold DateTime
 
   @@unique([guild_id, name])
   @@index([guild_id, created_at(sort: Desc)])