peachy-go/dbnames.md

The website schema needs to be discoverable. The `sqlite_schema` table (or the `table_list` pragma) and the `table_info` pragma are essential.

The following facts need to be discoverable:
- The name of each node type.
- The fields in each node type.
- The type of each field in a node.
- The subfields in each field type.
- The type of each subfield in a field.
- Whether a field or subfield is repeated, optional, or single.
- Whether a field has an application-primitive, but non-sqlite-primitive, type, such as datetime.
- Discriminated union fields.

Field types need to be acyclic. *Do they really?*

Field values need to be deleted when the node that contains them is deleted.

If field types are namespaced to a node type, then SQLite schema object naming will get harder.
	Maybe just let them be shared.

```
(node blogpost)
(composite-field car)
(node "car review")
(field cars)
(field car)
node:blogpost
field:

(: road-review node)
(: car composite-field)
-- Entity names must be qualified by their type/kind, or there can't be e.g. a node type and field type that share a name.
-- I think qualification is best, because then SQLite will prevent duplicates by the requirement that table names be unique.
(list (: car composite-field))


create table "car:composite-field" (
	id integer primary key,
	"Make" text not null,
	"Model" text not null,
	"Year" text not null,
	"Test distance" int not null,
	"Test date:date" text not null,
);

create table "road review.cars:(list-field (road review:node))" (
	"Road review:node" int primary key references "road review:node",
	"Car:composite-field" int primary key references "car:composite-field",
);

create table "Road review:node" (
	id integer primary key,
	"Title" text not null,
	"Cars:(list car)"
);

(field car)
(node review)
(list (field car) (node review)) -- If we parameterize each list relation by both the listed field and the containing node or field, then we've basically monomorphized it.
-- However, that won't cut it if a node or field contains multiple lists of the same type. We also need to parameterize list relations by the field name in the containing node or field.
```

```
primitive-field-type := int | text | date | 
record-field-type := (record <field-type-name> ((<field-name> <field-type>) ...))
variant-field-type := (variant <field-type-name> ((<field-name> <field-type>) ...))
field-type := (field <field-type-name>)
node-type := (node <node-type-name>)
parent-object-type := <field-type> | <node-type> 
list := (list <element-type> <parent-object-type> <field-name>)
```


```
(record car)
	(id integer)
	(make text)
	(model text)
	(year text)
	(test-distance integer)
	(test-date date)

(list car)
	(node road-review)
	(car car)

(node road-review)
	(id integer)
	(title text)
	(cars (list car))
```

```
(node <node-type-name>)
	id integer primary key
	(<composite-type-name> <field-name>) <db-type> ...
(list <composite-type-name>)
	id
(list-item <composite-type-name>)
	list-id references (list <composite-type-name>) primary key
	sequence-number primary key
	item-id references (composite-value <composite-type-name>)
(composite-value <composite-type-name>)
	id
	-- This indirection is so that SQLite will prevent duplicate field type names in table names.
	<record|variant>-value-id references (<record|variant>-value <composite-type-name>)
(record-value <composite-type-name>)
	id integer primary key
	(<composite-type-name> <field-name>) <db-type> ...
(variant-value <composite-type-name>)
	id integer primary key
	(<composite-type-name> <field-name>) <db-type> ...
```