-- AppView database schema 0005: profile metadata + per-post avatar refs.
--
-- Why
-- The Profile-View-Page and PostCard both render a user avatar.
-- Fetching the live `app.bsky.actor.profile/self` record from every
-- user's PDS on every render doesn't scale, and isn't always reachable
-- (e.g. a did:web: user whose PDS is offline). We cache the
-- denormalised profile fields the UI shows keyed by did, indexed by
-- handle so the `/api/profile/<handle>` lookup is index-driven.
--
-- Source of truth: the user's own PDS. The PDS pushes profile records
-- via the existing `/internal/ingest-commit` path; this migration
-- adds the `(collection, action, rkey) == ('app.bsky.actor.profile',
-- 'create', 'self')` arm to the AppView's indexer to populate this
-- table.
--
-- All fields nullable: a profile record can omit displayName,
-- description, avatar, banner independently.
--
-- post_count / follower_count / following_count are denormalised
-- counts populated only when the row is created/replaced; the
-- Profile-View-Page reads them here so it doesn't have to issue a
-- separate COUNT(*) over posts/follows.
--
-- The avatar_cid on posts is the resolved profile-avatar blob ref
-- (or NULL) for the post's author. The AppView fills it in at
-- upsert_post-time from the profiles table; the PostCard reads it
-- to inline an <Avatar cid={post.avatar_cid}/> without a per-row
-- PDS round-trip.

CREATE TABLE profiles (
    did                TEXT PRIMARY KEY,
    handle             TEXT NOT NULL,
    display_name       TEXT,
    description        TEXT,
    avatar_cid         TEXT,
    banner_cid         TEXT,
    post_count         BIGINT NOT NULL DEFAULT 0,
    follower_count     BIGINT NOT NULL DEFAULT 0,
    following_count    BIGINT NOT NULL DEFAULT 0,
    indexed_at         TIMESTAMPTZ NOT NULL DEFAULT now()
);
CREATE INDEX profiles_indexed_at_idx ON profiles (indexed_at DESC);

-- Backfill: seed a profile row for every handle we've already
-- resolved through the posts.did → posts.handle mapping. The display
-- fields stay NULL — they need the live PDS profile record.
INSERT INTO profiles (did, handle)
SELECT DISTINCT ON (did) did, handle
  FROM posts
 WHERE handle <> ''
 ORDER BY did, indexed_at DESC
ON CONFLICT (did) DO NOTHING;

ALTER TABLE posts ADD COLUMN IF NOT EXISTS avatar_cid TEXT;