Pool.gaugeAddress is empty string, not null, on ungauged pools (consumer trap)

[FonsSicca]

Source: data-quality audit of deployment 8fcf9a8 (2026-07-07). Full findings: Notion audit.

What to build

Remove the Pool.gaugeAddress consumer trap. The field is populated correctly on gauged pools, but on ungauged pools it is an empty string rather than null. A consumer applying a null filter therefore silently selects every row. On Base this affects 32,398 of 34,214 rows.

Acceptance criteria

• Ungauged pools carry null for gaugeAddress (or the trap is otherwise removed) so a null filter behaves as consumers expect.
• Existing gauged-pool values are unchanged.
• If the empty-string behavior is kept intentionally, the consumer querying doc calls it out explicitly.

Blocked by

None — can start immediately.