Added user email column. Also delete links when deleting objects.

dbschema.sql

@@ -42,7 +42,8 @@ CREATE TABLE "mosgroups" (
 
 CREATE TABLE "mosusers" (
   "userId" INTEGER PRIMARY KEY AUTOINCREMENT,
-  "name" TEXT
+  "name" TEXT,
+  "email" TEXT
 );
 
 CREATE TABLE "mosobjects" (
@@ -64,7 +65,7 @@ CREATE TABLE "mosobjects" (
 );
 
 CREATE TABLE "mosobjlinks" (
-    "objId" TEXT PRIMARY KEY REFERENCES "mosobjects" ("objId"),
+    "objId" TEXT PRIMARY KEY REFERENCES "mosobjects" ("objId") ON DELETE CASCADE,
     "planningId" TEXT
 );