feat(monetization): auto-upsell trigger at 50% free credit [0xcFDa9f32d292661740a6d0B4c00867E34c05c56D]

[meridianmindx]

Summary

Implements Issue #3 — auto-upsell trigger after the 5th free call (50% of the 10-call free limit).

Deliverables

• migrations/add_upsell_triggers.sql — idempotent upsell_triggers table + check_upsell_trigger() SQL function (fires once via UNIQUE constraint)
• src/monetization/upsell.ts — checkUpsellTrigger / applyUpsellHeaders middleware with A/B/C prompt variants and X-Upsell-Prompt: true header
• tests/upsell.test.ts — 8 Deno tests (threshold, idempotency, variants, headers, invalid input)

Acceptance criteria

• SQL: upsell_triggers table (user_id, trigger_type, shown_at, converted)
• Middleware checks call count and sets trigger flag
• Upsell prompt text variants (A/B/C, stable per user)
• Trigger fires exactly once per threshold crossing (idempotent)
• Tests: correct threshold detection, no double-trigger

Verification

deno test tests/upsell.test.ts
ok | 8 passed | 0 failed

Closes #3

Wallet (Base USDC)

0xcFDa9f32d292661740a6d0B4c00867E34c05c56D

Made with Cursor

[meridianmindx]

Friendly bump on this suite PR (and siblings #115–#118): all still mergeable with no review comments. Ready to adjust anything you want before merge. Base payout address is in the PR title.

[meridianmindx]

Friendly bump — ready for review/merge when you have bandwidth. Happy to iterate fast on any feedback.