Kraken Click Beacon

Fire-and-forget click beacon from the FE Kraken chip.

Accepts {click_id?, embedder_slug?, asset?}, emits a single structured kraken.click log line, and persists a zero-amount click :class:EmbedderRevenueEvent attributed to the embedder (so the affiliate roll-up can build a click→conversion funnel without a second table — same mechanics as the Polymarket click beacon). Rows are kraken-tagged via a kraken:-prefixed polymarket_subid + broker payload field so roll-ups can distinguish partners.

Best-effort discipline (matches the Polymarket beacon):

• Unknown / omitted embedder slug → fall back to the house embedder if one exists, else log-only (no DB row) and still 200. We never 500 a beacon.
• Replay within the same UTC day → IntegrityError on the dub_event_id UNIQUE constraint → rollback + NOOP, still 200.
• Any other persist failure → rollback + log, still 200 — a DB failure must never break the listener's outbound to Kraken.

Intentionally NOT FF-gated. KRAKEN_AFFILIATE_ENABLED controls whether we mint a Dub short link on :func:kraken_affiliate_link; if the operator temporarily flips it off, we still want to record the click attempts the chip is sending so we don't lose tracking on a transient disable.

Compliance posture matches the rest of this router: linkout-only surface, no "trade now" / "buy now" copy in the response body.