Hotfix v0.40.1 (APP-1313): slow /v2/members and /v2/transactions queries

[arabot-1]

Task: APP-1313

2 changes since v0.40.0

Fixes

• fix(transactions): check spam once per token before paging
• fix(members): count delegators from the index only

Why hotfix
Prod Mongo Atlas CPU spiked on 2026-10-07 (01:30 to 02:45 UTC). A scraper walked /v2/members and /v2/transactions for many DAOs. Two queries took about 14s each on Atlas: member delegation counts on big tokens (ARB, OP) and deep transaction pages (katana DAO, page 448). Any client or bot can trigger them again, so it can't wait for the next release.

What changed

• Members: the delegator count read every matching delegation log from disk. Now it runs one query for incoming and one for outgoing, each answered from its own index without reading the logs.
• Transactions: the spam check did a Token lookup on every row before skipping to the page, so page 448 did 22,400 lookups. Now spam is checked once per token in the count query, and the page query skips spam tokens with a plain filter, no lookup per row. includeSpam=true works as before.

Same results as before for both, only faster.

Checked on dev

• Members, ARB top 50 delegates: 4.7-6.9s before, about 1s now. 1,500 real members on the 10 biggest tokens, 0 mismatches.
• Transactions, katana DAO: page 448 6.4s → 1.9s, page 900 13.3s → 2.3s, page 1500 19.9s → 3.9s. Same rows and metadata on all checked pages (katana and a 134k-row sepolia DAO).
• Unit tests: 5 new for members, 8 new for transactions.

[linear-code]

APP-1313

[milosh86]

Looks good 👍