refactor channel

src-tauri/migrations/20230617003135_add_channel_messages.sql

@@ -0,0 +1,15 @@
+-- Add migration script here
+CREATE TABLE
+  channel_messages (
+    id INTEGER NOT NULL PRIMARY KEY,
+    channel_id TEXT NOT NULL,
+    event_id TEXT NOT NULL UNIQUE,
+    pubkey TEXT NOT NULL,
+    kind INTEGER NOT NULL,
+    content TEXT NOT NULL,
+    tags JSON,
+    mute BOOLEAN DEFAULT 0,
+    hide BOOLEAN DEFAULT 0,
+    created_at INTEGER NOT NULL,
+    FOREIGN KEY (channel_id) REFERENCES channels (event_id)
+  );