Per-site tag-type cache for boorus that don't return categories
inline. Uses string labels ("Artist", "Character", "Copyright",
"General", "Meta") instead of the integer codes the reverted
version used — the labels come directly from HTML class names,
no mapping step needed.
Schema: tag_types(site_id, name, label TEXT, fetched_at)
PRIMARY KEY (site_id, name)
Methods:
get_tag_labels(site_id, names) — chunked 500-name SELECT
set_tag_labels(site_id, mapping) — bulk INSERT OR REPLACE,
auto-prunes oldest entries when the table exceeds 50k rows
clear_tag_cache(site_id=None) — manual wipe, for future
Settings UI "Clear tag cache" button
The 50k row cap prevents unbounded growth over months of
browsing multiple boorus. Normal usage (a few thousand unique
tags per site) never reaches it. When exceeded, the oldest
entries by fetched_at are pruned first — these are the tags the
user hasn't encountered recently and would be re-fetched cheaply
if needed.
Migration: CREATE TABLE IF NOT EXISTS in _migrate(), non-breaking
for existing databases.
pax
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