16 lines
954 B
SQL
16 lines
954 B
SQL
-- The Cover splits into two facts. `cover` keeps the third-party address the
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-- bytes come from, which is what the refetch path dedupes on; `cover_address`
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-- is the content address of the bytes once they are actually stored, and is
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-- what the wire's absolute URL is built from.
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--
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-- Empty `cover_address` therefore means "no Cover yet" rather than "a Cover
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-- that 404s", which is the distinction the API and the UI both depend on.
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--
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-- The content address was originally the hex SHA-256 of the source URL
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-- (ADR-0007). Since ADR-0014 it is the hex SHA-256 of the bytes themselves,
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-- so a re-art behind the same URL is a new address. Rows written before
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-- ADR-0014 keep their URL-derived addresses; they are never rehashed and heal
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-- into byte addressing on their first forced replacement. Both derivations
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-- share the 64-hex-digit shape, so the serving guard is unchanged.
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ALTER TABLE series ADD COLUMN cover_address text NOT NULL DEFAULT '';
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