* feat: capture ad click IDs for Meta/Google/LinkedIn/TikTok/Reddit/Pinterest attribution
Adds gclid, fbclid, li_fat_id, ttclid, rdt_cid, and epik columns to users,
captured the same way UTM parameters already are (query string -> session
-> persisted on signup, surviving the OAuth redirect round-trip via the
new PreservesClickIds trait).
Forwards them as first-touch ($set_once) PostHog person properties in
SyncUser, so PostHog's native ad-platform destinations (Meta Ads
Conversions API, Google Ads Conversions, LinkedIn Ads, TikTok Ads, Reddit
Ads, Pinterest) have first-party click IDs to match conversions back to
the originating ad click.
* refactor: unify PreservesUtmParameters and PreservesClickIds into one trait
Both traits captured a set of query-string keys into the session and
retrieved them at signup, with identical extract/store/retrieve logic and
every call site always using both together — the split added no real
separation, just duplicated the same mechanism twice.
PreservesAttributionParameters replaces both with a single ATTRIBUTION_KEYS
list and one session key. Adding a future ad network's click ID is now one
line in that list instead of a second trait.
* refactor: split UTM_KEYS and CLICK_ID_KEYS into separate constants
Same single trait, single session key, single extract/store/retrieve
mechanism — just two named arrays instead of one merged list, so it's
clear at a glance which key belongs to which category.
* fix: don't truncate ad click IDs to 255 chars, only UTM parameters
Ad platforms explicitly warn against assuming a fixed max length for
click IDs (Google: gclid has already grown from 26 to 100+ chars, and
their docs say never truncate or validate against a fixed length).
Truncating would silently corrupt the value into something that no
longer matches the real click ID, which is worse than not capturing it
at all.
Widens the click-id columns from string (VARCHAR 255) to text — safe to
edit the migration in place since it hasn't shipped to production yet.
UTM parameters still get truncated to 255, since those are ours (our own
campaign URLs) and the column stays VARCHAR(255).
* refactor: use Laravel collection/Str helpers, forward UTMs to PostHog too
- extractAttributionParameters now reads through collect()/Str::limit()
instead of raw array_filter/array_map/mb_substr; storeAttributionParameters
drops its now-redundant emptiness check since retrieveAttributionParameters
already treats "absent" and "present-but-empty" the same via pull()'s
default.
- SyncUser forwards utm_source/medium/campaign/term/content alongside the
click ids as first-touch ($set_once) PostHog person properties. UTMs were
never sent to PostHog before this, on any prior code — now that PostHog is
the source of truth for ad-platform attribution, it should have the full
picture, not just click ids.
- Adds the missing GitHub-existing-user click-id session test, mirroring
the Google one (parity with the existing UTM coverage).
* fix: 3 issues found by review — empty-string leak, duplicated key list, comment style
- extractAttributionParameters no longer keeps an empty-string value (e.g.
?utm_source=&gclid=, which some ad/email templates always append even
for unfilled slots). The refactor to collect()/Str::limit() a few
commits back dropped the outer array_filter() that used to strip these,
so they were slipping into User::create() as '' instead of staying
null. Restored via a trailing ->filter() on the merged result, and
extended the same protection to click ids (which never had it, even
before that refactor).
- New App\Support\AttributionKeys centralizes the UTM_KEYS/CLICK_ID_KEYS
lists that PreservesAttributionParameters and SyncUser each maintained
independently. SyncUser previously hand-listed the same 11 field names
as a second array with no shared source of truth — a future ad network
added to the trait would silently never reach PostHog unless someone
remembered to update this second copy too.
- Removed the // comment block from the click-id migration explaining the
text-column rationale — CLAUDE.md's PHP rules reserve inline comments
for exceptionally complex logic; the rationale already lives in the
commit message that introduced it.
ca1e346227