add motd schema and motd editor

app/schema.py

@@ -120,6 +120,18 @@ SCHEMA = [
     UNIQUE(collection_id, thread_id)
     )""",
 
+    """CREATE TABLE IF NOT EXISTS "motd" (
+    "id" INTEGER NOT NULL PRIMARY KEY,
+    "title" TEXT NOT NULL,
+    "body_original_markup" TEXT NOT NULL,
+    "body_rendered" TEXT NOT NULL,
+    "markup_language" TEXT NOT NULL DEFAULT 'babycode',
+    "format_version" INTEGER DEFAULT NULL,
+    "created_at" INTEGER DEFAULT (unixepoch(CURRENT_TIMESTAMP)),
+    "edited_at" INTEGER DEFAULT (unixepoch(CURRENT_TIMESTAMP)),
+    "user_id" REFERENCES users(id) ON DELETE CASCADE
+    )""",
+
     # INDEXES
     "CREATE INDEX IF NOT EXISTS idx_post_history_post_id ON post_history(post_id)",
     "CREATE INDEX IF NOT EXISTS idx_posts_thread ON posts(thread_id, created_at, id)",