server: 去除msg_type not null限制

packages/server/src/db.js

@@ -51,7 +51,7 @@ async function initDB(dbFile) {
         `CREATE TABLE IF NOT EXISTS msg (
     msg_id TEXT NOT NULL,
     create_time INTEGER NOT NULL,
-    msg_type INTEGER NOT NULL,
+    msg_type INTEGER,
     composed_type TEXT NOT NULL,
     content TEXT,
     from_name TEXT,

packages/server/src/socket.js

@@ -208,7 +208,7 @@ async function sendMessage(_, { type, target, data, filename }) {
     messageID: composedID,
     createTimestamp: timestamp,
     type,
-    messageType: null,
+    messageType: 0,
     fromName: bot.user.NickName,
     fromNickName: bot.user.NickName,
     toName: getDisplayName(targetContact),