A user who set their profile via the PDS push path before
posting anything has a row in `profiles` but no rows in
`posts` — the handle→DID lookup in `resolve_profile` only
checked `posts`, so the route synthesised an empty profile
(`did: ""`) for these users.
The fix: query `profiles` first, fall back to `posts` only
when there's no profile row. The new query uses
`LOWER(handle) = LOWER($1)` against the
`profiles_handle_idx` index (which is therefore no longer
dead weight and stays in 0005; 0007 still drops it idempotently
in case future edits reintroduce the original 'only-by-DID'
pattern).
Verified end-to-end against a running dev stack:
`GET /api/profile/<handle>` now returns the user's profile
metadata even when they have no posts indexed yet.
Adds the AppView-side half of the profile feature so non-local-PDS
authors also get their profile metadata indexed (the Jetstream
identity event stream only carries the handle, not display name /
bio / avatar). The PDS-push path was already wired by the previous
commit; this lands the Jetstream path.
Migration 0005:
* `profiles` table keyed by DID with display_name / description /
avatar_cid / banner_cid plus denormalised post_count /
follower_count / following_count. Backfilled from the posts
table on apply.
* `posts.avatar_cid` column — populated from the profiles cache
at `upsert_post` time so the PostCard can render an avatar
inline without a per-row PDS round trip.
Migration 0007 (clean-up): the original 0005 also created a
`LOWER(handle)` index that no query uses; this drops it
idempotently so dev DBs that already applied 0005 converge.
Indexer (`crates/appview/src/indexer.rs`):
* New `app.bsky.actor.profile` arm in `apply_commit` calls
`upsert_profile` on create, DELETEs the row on delete. Handle
is looked up from `posts` (the Jetstream commit envelope
doesn't carry it).
* `upsert_post` signature is now `&mut PostRow` so it can fill
`row.avatar_cid` from the profiles cache; the ON CONFLICT
clause uses `COALESCE(EXCLUDED, posts)` so re-indexing doesn't
overwrite an already-known avatar.
* `upsert_profile` writes display_name / description /
avatar_cid / banner_cid + the denormalised counts.
* `blob_link_of` helper accepts both `{ $type, ref.$link }`
and legacy flat `{ $link }` blob-ref shapes.
Ingest (`crates/appview/src/ingest.rs`):
* `app.bsky.actor.profile` create/delete arms in the PDS-push
path. The handle-fallback previously did `SELECT handle FROM
users WHERE did = $1` — but the AppView has no `users` table
(it's PDS-owned state). Replaced with a simple use-what-the-PDS-
sent approach; the handle_sync worker fills the column later.
Routes (`crates/appview/src/routes.rs`):
* `resolve_profile` reads the denormalised profile fields from
the cache. When no profile row exists the `post_count` fallback
uses a live `SELECT COUNT(*)` instead of `posts.len()`, so
prolific authors without a profile row report the real count
rather than the 50-post slice cap.
Tests (DB-gated, run when DATABASE_URL_APPVIEW is set):
* `blob_link_of_modern_shape` / `_legacy_flat_link` /
`_missing_field`.
* `upsert_profile_round_trip` — insert + replace semantics.
* `apply_commit_indexes_profile_create` — end-to-end Jetstream
arm + delete.
tomdebone