do db changes needed for join command persistance

prisma/migrations/20230211170253_channels/migration.sql

@@ -0,0 +1,8 @@
+-- CreateTable
+CREATE TABLE "Channel" (
+    "id" TEXT NOT NULL PRIMARY KEY,
+    "name" TEXT NOT NULL
+);
+
+-- CreateIndex
+CREATE UNIQUE INDEX "Channel_name_key" ON "Channel"("name");

prisma/schema.prisma

@@ -10,6 +10,11 @@ datasource db {
   url      = env("DATABASE_URL")
 }
 
+model Channel {
+  id   String @id @default(uuid())
+  name String @unique
+}
+
 model User {
   id     String @id @default(uuid())
   userId String @unique