feat(data-api): migrate account_position_daily to Postgres

[JSONbored]

Summary

• Gap-closure from the fix(data-api): 25 more D1-only handlers — some serving frozen data since the streamer stopped #4832 completeness sweep: account_position_daily was D1-only because its Postgres table didn't exist yet. Its source data (the neurons snapshot) is already synced into Postgres via handleNeuronsSync (Build the metagraph/neuron pipeline's missing Postgres write path (neurons + neuron_daily) #4771), so this rolls the account-position rollup into the SAME write transaction rather than standing up new infrastructure.
• Adds the table + indexes to deploy/postgres/schema.sql (mirrors D1 migrations/0038_account_position_daily.sql).
• Extends handleNeuronsSync to upsert account_position_daily rows (hotkey IS NOT NULL, same filter as the D1 rollup) inside the existing sql.begin() transaction.
• Adds the read route GET /api/v1/accounts/:ss58/subnets/:netuid/history and wires tryPostgresTier into handleAccountPositionHistory.

Test plan

• npx vitest run tests/data-api.test.mjs tests/request-handlers-entities.test.mjs — 189 + 490 tests pass (new write-path tests confirm the INSERT + null-hotkey skip; new read-route tests cover the happy path + ?window=all; new wiring tests confirm postgres-wins/falls-back-to-D1)
• npx vitest run (full repo) — 259 files / 7374 tests pass
• npm run lint / npx prettier --check on touched files — clean
• npm run test:coverage + manual branch-coverage isolation on the diff — every uncovered branch confirmed pre-existing/outside the patch

Deploy note

This PR does NOT yet apply deploy/postgres/schema.sql to the live box — that happens as a separate manual step after merge (idempotent CREATE TABLE IF NOT EXISTS, applied via psql), followed by redeploying metagraphed-data-api.

Refs #4832

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	metagraphed-data-api	a493ae3	Commit Preview URL Branch Preview URL	Jul 11 2026, 04:33 AM

[superagent-security]

Superagent didn't find any vulnerabilities or security issues in this PR.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.77%. Comparing base (e3246cf) to head (a493ae3).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4839   +/-   ##
=======================================
  Coverage   97.77%   97.77%           
=======================================
  Files         162      162           
  Lines       19124    19137   +13     
  Branches     7185     7188    +3     
=======================================
+ Hits        18699    18712   +13     
  Misses         59       59           
  Partials      366      366           

Files with missing lines	Coverage Δ
workers/data-api.mjs	99.57% <100.00%> (+<0.01%)	⬆️
workers/request-handlers/entities.mjs	99.34% <100.00%> (-0.01%)	⬇️

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