Failing if entity name is "Group"

[brunobuddy]

If the name of the entity is "Group" there is some weird behaviours: https://discord.com/channels/1089907785178812499/1323062280581152828/1323062280581152828

We should check that entity names do not overlap reserved words in SQLite to prevent those issues. Or find a workaround

[cosatsil]

To be clear, this is not about the name "Group". It is about any case in which a relationship with another entity is named the same as that entity (or the same but in plural form). For example, any of the following:

{ name: units, entity: Unit }
{ name: events, entity: Event }
{ name: bags, entity: Bag }

will trigger an error.