feat(substations): transmission_line_endpoints join table + sync (PR 6/9)#199
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…c (PR 6/9) Implements transmission_line_endpoints join table to replace fuzzy sub1/sub2 string references with formal foreign keys. Includes fuzzy matching sync script with confidence scoring for community review workflow. **What's included:** - Schema: transmission_line_endpoints table with role (from|to) and match_confidence - Migration: 0005_transmission_line_endpoints.sql with indexes - Sync script: fuzzy-matches transmission_lines.sub1/sub2 against substation names - Levenshtein + suffix-variation matching for reliability - Match confidence (0..1) for high/medium/low confidence filtering **Features:** - Auto-matches high-confidence pairs (≥0.85) - Flags lower-confidence for community review - Handles common suffix variations (SUBSTATION/STATION/SUB) - Batch insert with upsert support **Next:** - PR #7: power_plant_interconnections join + sync - PR #8: Join query API endpoints - PR #9: Docs + catalog --- *Part of CommonGrid 9th entry point milestone (substations) — PR 6 of 9*
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Vercel Pro plan enforces a max of 800 seconds for serverless function maxDuration. The previous 1800s value caused the build to succeed but deployment to fail at the patchBuild step with: Builder returned invalid maxDuration value for Serverless Function "api/cron/sync-substations". Serverless Functions must have a maxDuration between 1 and 800 for plan pro. Capping at 800 unblocks deploys. Full US substation syncs that exceed this should be moved to a long-running runner (GitHub Actions, Render, etc.) rather than a Vercel serverless function.
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Reopening after incorrect close during fallback merge. CI ✓, ready to merge. |
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Part of the substations 9th entry point epic.
Adds
transmission_line_endpointsjoin table linking substations to the transmission lines they terminate, plus a sync script that populates it from HIFLD line geometries (endpoint matching with confidence scores).Stack: PR 6/9 (base: #198 [PR 5 cron])
Enables spatial graph traversal: for any substation, which transmission lines come in and go out.