Implemented /wallet/history — unified transaction history from 3 data sources

[mtarcure]

Hey all — just submitted PR #997 implementing the /wallet/history endpoint that was missing (issues #775 and #886).

What it does

The endpoint was documented in the API spec but only queried pending_ledger. The rewrite pulls from three sources:

• ledger table — confirmed transfers (the immutable chain)
• epoch_rewards table — mining reward payouts
• pending_ledger — in-flight transfers that haven't confirmed yet

Returns a unified, time-sorted response:

{
  "ok": true,
  "miner_id": "dual-g4-125",
  "transactions": [
    {"type": "reward", "amount": 0.297, "epoch": 424},
    {"type": "transfer_in", "from": "founder_community", "amount": 10.0}
  ],
  "total": 42
}

Added offset pagination alongside limit, and handles missing tables gracefully so it works on nodes that don't have all tables populated.

PR: #997

Feedback welcome — especially on edge cases with the miner_id vs address resolution.