Product identity
Collection and effective time
Explicit status values
Anomaly controls
Source compliance
Make records comparable first
Product, specification, region, membership state, and collection time must align before prices or rankings can be compared. Preserve the source URL, timestamp, raw value, parsed value, and task state.
Maintain auditable identity mapping
Map internal SKUs to external products with specification, channel, and effective dates. Let people review low-confidence matches and keep unmatched, conflicting, and specification-mismatch states separate.
Treat page changes as data events
Do not collapse unavailable, out of stock, empty, and parsing failure into zero. Page structure and access changes should pause downstream conclusions. Exact BI0 site, field, frequency, and compliance support requires confirmation.
Protect downstream analysis
Set jump, range, duplicate, and consecutive-missing rules. Validate identity matching, status classification, parsing, anomaly recall, and duplicate creation after recovery.
Public references
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