fix: generate UUID v7 by default

[marandaneto]

💡 Motivation and Context

SDK-generated IDs should use UUID v7 so they are time-ordered. This updates the default UUID path used for event uuid values and personless distinct IDs created from request context, while preserving caller-provided UUIDs unchanged.

💚 How did you test it?

• go test ./...

📝 Checklist

• I reviewed the submitted code.
• I added tests to verify the changes.
• I updated the docs if needed.
• No breaking change or entry added to the changelog.

If releasing new changes

• Ran pnpm changeset to generate a changeset file

🤖 Agent context

Autonomy: Human-driven (agent-assisted)

Implemented by a delegated coding agent from explicit maintainer direction to migrate SDK-generated UUIDs from v4/random to v7. Chose the existing github.com/google/uuid dependency's NewV7() API and kept explicit user-provided UUID behavior unchanged.

[greptile-apps]

Prompt To Fix All With AI

Fix the following 1 code review issue. Work through them one at a time, proposing concise fixes.

---

### Issue 1 of 1
request_context_test.go:100-104
**Repeated UUID v7 assertion block**

The three-line pattern `uuid.Parse` → `require.NoError` → `require.Equal(t, uuid.Version(7), ...)` is duplicated verbatim at lines 100–104, 259–263, and 289–293. A small helper — e.g. `requireUUIDv7(t testing.TB, s string)` — would satisfy the OnceAndOnlyOnce principle and keep future version bumps to a single change site.

_{Reviews (1): Last reviewed commit: "fix: generate UUID v7 by default" | Re-trigger Greptile}

[github-actions]

posthog-go Compliance Report

Date: 2026-06-19 12:30:56 UTC
Duration: 3717754ms

⚠️ Some Tests Failed

32/45 tests passed, 13 failed

---

Capture Tests

✅ 29/29 tests passed

View Details

Test	Status	Duration
Format Validation.Event Has Required Fields	✅	610ms
Format Validation.Event Has Uuid	✅	608ms
Format Validation.Event Has Lib Properties	✅	608ms
Format Validation.Distinct Id Is String	✅	608ms
Format Validation.Token Is Present	✅	608ms
Format Validation.Custom Properties Preserved	✅	608ms
Format Validation.Event Has Timestamp	✅	608ms
Retry Behavior.Retries On 503	✅	5613ms
Retry Behavior.Does Not Retry On 400	✅	2611ms
Retry Behavior.Does Not Retry On 401	✅	2611ms
Retry Behavior.Respects Retry After Header	✅	5613ms
Retry Behavior.Implements Backoff	✅	15609ms
Retry Behavior.Retries On 500	✅	5612ms
Retry Behavior.Retries On 502	✅	5613ms
Retry Behavior.Retries On 504	✅	5613ms
Retry Behavior.Max Retries Respected	✅	15624ms
Deduplication.Generates Unique Uuids	✅	616ms
Deduplication.Preserves Uuid On Retry	✅	5612ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	10619ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	5614ms
Deduplication.No Duplicate Events In Batch	✅	612ms
Deduplication.Different Events Have Different Uuids	✅	611ms
Compression.Sends Gzip When Enabled	✅	608ms
Batch Format.Uses Proper Batch Structure	✅	607ms
Batch Format.Flush With No Events Sends Nothing	✅	606ms
Batch Format.Multiple Events Batched Together	✅	611ms
Error Handling.Does Not Retry On 403	✅	2610ms
Error Handling.Does Not Retry On 413	✅	2610ms
Error Handling.Retries On 408	✅	5613ms

Feature_Flags Tests

⚠️ 3/16 tests passed, 13 failed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	❌	8ms
Request Payload.Flags Request Uses V2 Query Param	✅	6ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	6ms
Request Payload.Flags Request Omits Authorization Header	✅	5ms
Request Payload.Token In Flags Body Matches Init	❌	300710ms
Request Payload.Groups Round Trip	❌	300996ms
Request Payload.Groups Default To Empty Object	❌	301038ms
Request Payload.Person Properties Distinct Id Auto Populated When Caller Omits It	❌	301011ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	❌	301004ms
Request Payload.Disable Geoip Omitted Defaults To False	❌	300949ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	❌	301037ms
Request Lifecycle.No Flags Request On Init Alone	❌	300953ms
Request Lifecycle.No Flags Request On Normal Capture	❌	300984ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	❌	301063ms
Request Lifecycle.Mock Response Value Is Returned To Caller	❌	300986ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	❌	301011ms

Failures

request_payload.request_with_person_properties_device_id

Field 'distinct_id' not found in /flags request body at path 'person_properties.distinct_id'. Available keys: ['$device_id']

request_payload.token_in_flags_body_matches_init

No error message

request_payload.groups_round_trip

No error message

request_payload.groups_default_to_empty_object

No error message

request_payload.person_properties_distinct_id_auto_populated_when_caller_omits_it

No error message

request_payload.disable_geoip_false_propagates_as_geoip_disable_false

No error message

request_payload.disable_geoip_omitted_defaults_to_false

No error message

request_payload.flag_keys_to_evaluate_contains_only_requested_key

No error message

request_lifecycle.no_flags_request_on_init_alone

No error message

request_lifecycle.no_flags_request_on_normal_capture

No error message

request_lifecycle.two_flag_calls_produce_two_remote_requests

No error message

request_lifecycle.mock_response_value_is_returned_to_caller

No error message

side_effect_events.get_feature_flag_captures_feature_flag_called_event

No error message