Keep visualization dynamic even between unmigrate and migrate (without page refresh) - make automatic reconnect

At the moment when unmigrate is executed, DeepCase visualization fails with error:

I expect no errors in this case, just show empty screen if there is no data in database (including the case when there is no links table). Once links table is created, subscription to data should be restored. Just like on page refresh or better.

I would like to see all changes in data if possible. I also want the client to be stable (no page refresh is required).

```
Unhandled Runtime Error
Error: field "links" not found in type: 'query_root'

Call Stack
new ApolloError
node_modules/@apollo/client/errors/index.js (29:0)
eval
node_modules/@apollo/client/core/QueryManager.js (592:0)
both
node_modules/@apollo/client/utilities/observables/asyncMap.js (16:44)
eval
node_modules/@apollo/client/utilities/observables/asyncMap.js (9:55)
new Promise

Object.then
node_modules/@apollo/client/utilities/observables/asyncMap.js (9:0)
Object.eval [as next]
node_modules/@apollo/client/utilities/observables/asyncMap.js (17:0)
notifySubscription
node_modules/zen-observable-ts/module.js (132:0)
onNotify
node_modules/zen-observable-ts/module.js (176:0)
SubscriptionObserver.next
node_modules/zen-observable-ts/module.js (225:0)
eval
node_modules/@apollo/client/utilities/observables/iteration.js (4:48)
Array.forEach

iterateObserversSafely
node_modules/@apollo/client/utilities/observables/iteration.js (4:0)
Object.next
node_modules/@apollo/client/utilities/observables/Concast.js (25:42)
notifySubscription
node_modules/zen-observable-ts/module.js (132:0)
onNotify
node_modules/zen-observable-ts/module.js (176:0)
SubscriptionObserver.next
node_modules/zen-observable-ts/module.js (225:0)
eval
node_modules/@apollo/client/link/http/createHttpLink.js (103:0)
```

Start with the DeepCase visualization's Apollo Client query or subscription that requests links, and reproduce the unmigrate flow without refreshing. Trace how the client handles the missing links field and restores the subscription after the links table exists. Done means an empty database or absent links table shows no error, and later data changes appear without a page refresh.

Written by the indexing model from the issue text.