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docs: add update policy for dataset buyers

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  1. UPDATE_POLICY.md +25 -0
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+ # Update Policy — Ethno-API Dataset
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+ ## Release Schedule
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+ The full dataset is refreshed annually.
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+ Next scheduled update: Q1 2027.
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+
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+ ## Enrichment Sources
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+ - PubMed via NCBI E-utilities (esearch)
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+ - ClinicalTrials.gov API v2
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+ - ChEMBL REST API (with PubChem InChIKey fallback)
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+ - PatentsView REST API (USPTO)
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+
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+ ## Versioning
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+ Current version: v2.0 (March 2026)
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+ All versions are tagged in this repository.
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+
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+ ## Buyer Notifications
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+ All dataset buyers receive email notification when a new version is available.
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+ Buyers of v2.0 receive the v2.1 update free of charge.
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+
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+ ## Breaking Changes
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+ Schema changes are announced minimum 30 days in advance via GitHub Discussions.
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+
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+ ## Known Limitations
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+ See METHODOLOGY.md for full documentation of data quality limitations and noise exclusions.