Entity

An entity is a table — and the rules that are true about it. Not just its columns: what must hold for a row to exist, and who may see or change it…

`==` on two entity references compares them by ROW IDENTITY — not by object reference, and not field by field. Two references to the same row are…

Refuses an update whose value was changed by somebody else since this writer read it. Field-scoped — two people editing different fields of one…

`[FrontMatter]` binds a member to a key of the entity's markdown document's front-matter — the `---` header at the top of the file. Assigning the…

The per-member rules the database enforces — Required, Unique, MaxLength/MinLength, Min/Max, Pattern, and the storage-shaping Immutable, Precision…

Declares a persisted type — a table of rows the app stores, queries and secures. Every entity gets an Id and audit columns from the platform. Use a…

Derives one entity from another. The subtype is its own type with its own name, its own security and its own workflows, and it carries every member…

The typed members an entity holds — text, numbers, dates, booleans, Guids, enums and references. A member's type spelling carries its nullability: a…

A row-level rule spanning several members, checked when the row is written. Use it when a constraint on one member is not enough — a balance that may…

One entity points at another by declaring it as a member — that is the foreign key. The parent reads its children back through a collection member…

Declares that no type may derive from this entity. A type is open unless it says otherwise, exactly as in C#. Sealing says nothing about who may read…