Should be a final ulitmate fix for request timeout issue (#4045)

* Try to fix timeout again

* Ops

db/patch-timeout.sql

@@ -0,0 +1,7 @@
+-- You should not modify if this have pushed to Github, unless it does serious wrong with the db.
+BEGIN TRANSACTION;
+
+UPDATE monitor SET timeout = (interval * 0.8)
+WHERE timeout IS NULL OR timeout <= 0;
+
+COMMIT;

server/database.js

@@ -83,6 +83,7 @@ class Database {
         "patch-add-gamedig-given-port.sql": true,
         "patch-notification-config.sql": true,
         "patch-fix-kafka-producer-booleans.sql": true,
+        "patch-timeout.sql": true,
     };
 
     /**

server/model/monitor.js

@@ -369,7 +369,7 @@ class Monitor extends BeanModel {
 
             // Runtime patch timeout if it is 0
             // See https://github.com/louislam/uptime-kuma/pull/3961#issuecomment-1804149144
-            if (this.timeout <= 0) {
+            if (!this.timeout || this.timeout <= 0) {
                 this.timeout = this.interval * 1000 * 0.8;
             }