feat: add ref_drug_snomed_mapping schema (Task 1.1)

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- Add REF_DRUG_SNOMED_MAPPING_SCHEMA with 11 columns for direct SNOMED mapping
- Add 5 indexes for lookup performance (drug, cleaned_drug, snomed, search_term, composite)
- Add create_drug_snomed_mapping_table() helper function
- Update helper functions (drop, get_counts, verify_exists) to include new table
- Table is included in REFERENCE_TABLES_SCHEMA and created by migration

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This commit is contained in:

Andrew Charlwood

2026-02-05 14:06:16 +00:00

parent fa72fb3098

commit 9943e85761

3 changed files with 346 additions and 1271 deletions

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