29 lines
1.4 KiB
Markdown
29 lines
1.4 KiB
Markdown
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A "cartodb" user table is a table with a well-known set of fields and a well-known set of triggers attached on.
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The fields are:
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- `cartodb_id`, a numerical primary key of serial type
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- `created_at`, timestamp with timezone not null default now()
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- `updated_at`, timestamp with timezone not null default now()
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- `the_geom`, geometry, GiST indexed, constrained (see below)
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- `the_geom_webmercator`, geometry, GiST indexed, constrained (see below)
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The values of "the_geom" and "the_geom_webmercator" must match these constraints:
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- Only POINT, MULTILINE, MULTIPOLYGON types ? Maybe UNCONSTRAINED
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- Only 2 dimensions ? Maybe UNCONSTRAINED
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- SRID=4326 for the_geom and SRID=3857 for the_geom_webmercator
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The triggers are:
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- `track_updates` after modifying statement updates cdb_tablemetadata
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- `test_quota` before changing statement to forbid if overquota
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- `test_quota_per_row` before changing row to forbod if overquota (checked on a probabilistic basis)
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- `update_the_geom_webmercator` before insert or update row to maintain the_geom_webmercator
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- `update_updated_at_trigger` before update row to maintain updated_at
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Some conversions will be attempted to perform upon cartodbfication when certain fields appear:
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- `cartodb_id`: If found type TEXT will be attempted to cast
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- `created_at`: If found type TEXT will be attempted to cast
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- `updated_at`: If found type TEXT will be attempted to cast
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