feat: add author-username search to feed/gists/projects listings and partial-index migration

Extend `database.text_search_clause` with an `author_field` parameter that resolves username matches to user UIDs, enabling author-username search across the three public listings (`/feed`, `/gists`, `/projects`). Update the corresponding API docs and README route descriptions to reflect the new search scope. Add six partial indexes (`idx_comments_target_live`, `idx_votes_target_live`, `idx_reactions_target_live`, `idx_gists_live_created`, `idx_projects_live_created`, `idx_attachments_user_created_live`) to optimize filtered queries on non-deleted rows. Introduce a hot-settings cache (`_hot_settings`) with a 2-second TTL for `maintenance_mode`, `rate_limit_per_minute`, and `rate_limit_window_seconds`, plus a periodic rate-limit store sweep (`_sweep_rate_limit_store`) to evict stale IP entries every 60 seconds. Add `GZipMiddleware` to the FastAPI app for response compression.

tests/unit/database.py

@@ -522,3 +522,75 @@ def test_load_comments_drops_blocked_author(local_db):
 
     others = load_comments("post", post_uid, None)
     assert len(others) == 1
+
+
+def test_get_uids_by_username_match_returns_matching_uids(local_db):
+    from devplacepy.database import get_uids_by_username_match
+
+    target = generate_uid()
+    get_table("users").insert(
+        {
+            "uid": target,
+            "username": "searchablehero",
+            "created_at": _now_db_helpers(),
+        }
+    )
+    assert target in get_uids_by_username_match("searchablehero")
+    assert target in get_uids_by_username_match("hablehe")
+    assert get_uids_by_username_match("") == []
+
+
+def test_text_search_clause_matches_author_username(local_db):
+    from devplacepy.database import text_search_clause
+
+    author = generate_uid()
+    get_table("users").insert(
+        {
+            "uid": author,
+            "username": "authorquery",
+            "created_at": _now_db_helpers(),
+        }
+    )
+    post_uid = _post(author, title="unrelated title", content="unrelated body")
+    posts = get_table("posts")
+
+    clause = text_search_clause(
+        posts, "authorquery", ("title", "content"), author_field="user_uid"
+    )
+    assert clause is not None
+    rows = list(posts.find(clause, deleted_at=None))
+    assert post_uid in {r["uid"] for r in rows}
+
+
+def test_text_search_clause_without_author_field_ignores_username(local_db):
+    from devplacepy.database import text_search_clause
+
+    author = generate_uid()
+    get_table("users").insert(
+        {
+            "uid": author,
+            "username": "lonelyauthor",
+            "created_at": _now_db_helpers(),
+        }
+    )
+    _post(author, title="nothing here", content="nothing here either")
+    posts = get_table("posts")
+
+    clause = text_search_clause(posts, "lonelyauthor", ("title", "content"))
+    rows = list(posts.find(clause, deleted_at=None)) if clause is not None else []
+    assert all(r["user_uid"] != author for r in rows)
+
+
+def test_text_search_clause_still_matches_text_fields(local_db):
+    from devplacepy.database import text_search_clause
+
+    author = _user_db_helpers()
+    post_uid = _post(author, title="distinctivekeyword", content="body text")
+    posts = get_table("posts")
+
+    clause = text_search_clause(
+        posts, "distinctivekeyword", ("title", "content"), author_field="user_uid"
+    )
+    assert clause is not None
+    rows = list(posts.find(clause, deleted_at=None))
+    assert post_uid in {r["uid"] for r in rows}