Bayer's seed-treatment catalog query re-serves products from
herbicide/fungicide/insecticide queries that have seed-treatment use
sites listed. safe_slug() correctly strips the class suffix when the
catalog product type matches, but doesn't strip when querying as
seed-treatment, so the same product gets written twice — once as
"<base>" (canonical class) and once as "<base>-<class>"
(class=seed-treatment).
First full scrape produced 159 files for 87 unique EPA reg nos —
~45% redundant. Fix:
- process_product accepts an optional seen_regs set and returns
"dup-skip" when the product's EPA reg no is already in it.
- run() seeds seen_regs from existing sidecars on disk via
_load_seen_regs() so dedup survives re-runs (force overrides).
- run() updates seen_regs after each successful write, so within-run
dedup works for the seed-treatment query (which iterates last).
Important nuance preserved: when two genuinely-different brand-name
products share the same EPA reg (e.g., Absolute Maxx + Adament Flow
both = 264-849), they are NOT treated as dups — they're different
catalog entries with different slugs and same canonical class. Only
the seed-treatment-clone pattern (slug = <canonical>-<class> AND
class=seed-treatment AND sibling at same reg with matching class) is
the bug we're fixing.
One-off cleanup of the existing USB corpus removed 68 dup pairs;
159 → 91 files (73 canonical-class + 18 true seed-treatments).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
justin
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