feat: global exercise-name autocomplete

Autocomplete now draws from every user's logged exercises, not
just the requesting user's history. New users get suggestions from
day one.

- db.get_all_exercise_names(): case-insensitive grouping, ordered
  by usage count desc, alphabetical tiebreak, excludes names that
  only appear in soft-deleted workouts.
- server.api_get_exercise_names simplified to a one-liner.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

db.py

@@ -252,6 +252,24 @@ def get_workout_count(user_id: int) -> int:
         return row["cnt"]
 
 
+def get_all_exercise_names() -> list[str]:
+    """Return exercise names across all users (for autocomplete), ordered by
+    popularity (most-used first), then alphabetically. Case-insensitive
+    grouping — each distinct name is returned once in its most-used casing.
+    """
+    with get_db() as conn:
+        rows = conn.execute(
+            """SELECT e.name, COUNT(*) AS n
+               FROM exercises e
+               JOIN superset_groups sg ON sg.id = e.superset_group_id
+               JOIN workouts w ON w.id = sg.workout_id
+               WHERE w.deleted_at IS NULL
+               GROUP BY LOWER(e.name)
+               ORDER BY n DESC, LOWER(e.name) ASC""",
+        ).fetchall()
+        return [r["name"] for r in rows]
+
+
 def get_stats_sql(user_id: int) -> dict:
     """Compute stats entirely in SQL."""
     with get_db() as conn:

server.py

@@ -17,7 +17,7 @@ from urllib.parse import parse_qs
 
 from aiohttp import web
 
-from db import init_db, get_db, save_workout, get_workouts, get_workout_count, get_stats_sql, delete_workout, update_workout, export_workouts, get_user_workout_number
+from db import init_db, save_workout, get_workouts, get_workout_count, get_stats_sql, delete_workout, update_workout, export_workouts, get_user_workout_number, get_all_exercise_names
 from parser import parse_workout, format_workout
 
 logging.basicConfig(
@@ -263,18 +263,10 @@ async def api_delete_workout(request: web.Request):
 
 @require_auth
 async def api_get_exercise_names(request: web.Request):
-    """Return unique exercise names this user has logged (for autocomplete)."""
-    with get_db() as conn:
-        rows = conn.execute(
-            """SELECT DISTINCT e.name
-               FROM exercises e
-               JOIN superset_groups sg ON sg.id = e.superset_group_id
-               JOIN workouts w ON w.id = sg.workout_id
-               WHERE w.user_id = ?
-               ORDER BY e.name""",
-            (request["user_id"],),
-        ).fetchall()
-    return web.json_response({"exercises": [r["name"] for r in rows]})
+    """Return exercise names (for autocomplete), aggregated globally across
+    all users and ordered by popularity.
+    """
+    return web.json_response({"exercises": get_all_exercise_names()})
 
 
 @require_auth

tests/test_db.py

@@ -211,6 +211,48 @@ class TestUserNumbering:
         assert db.resolve_user_number(user_id=2, user_number=1) is None
 
 
+# ── global exercise names ────────────────────────────────────────
+
+
+class TestAllExerciseNames:
+    def test_empty(self, tmp_db):
+        assert db.get_all_exercise_names() == []
+
+    def test_draws_from_all_users(self, tmp_db):
+        _save_simple(user_id=1, name="Bench")
+        _save_simple(user_id=2, name="Squat")
+        names = db.get_all_exercise_names()
+        assert set(names) == {"Bench", "Squat"}
+
+    def test_ordered_by_popularity(self, tmp_db):
+        # Squat appears 3x (across users); Bench 2x; Rows 1x.
+        for _ in range(3):
+            _save_simple(name="Squat")
+        for _ in range(2):
+            _save_simple(name="Bench")
+        _save_simple(name="Rows")
+        assert db.get_all_exercise_names() == ["Squat", "Bench", "Rows"]
+
+    def test_case_insensitive_grouping(self, tmp_db):
+        _save_simple(name="bench press")
+        _save_simple(name="Bench Press")
+        _save_simple(name="BENCH PRESS")
+        names = db.get_all_exercise_names()
+        assert len(names) == 1  # collapsed into one group
+
+    def test_excludes_deleted_workouts(self, tmp_db):
+        wid = _save_simple(name="Deadlift")
+        _save_simple(name="Squat")
+        db.delete_workout(1, wid)
+        assert db.get_all_exercise_names() == ["Squat"]
+
+    def test_alphabetical_tiebreak(self, tmp_db):
+        # All tied at 1 usage — should come back alphabetical.
+        for n in ["Zebra", "Apple", "Mango"]:
+            _save_simple(name=n)
+        assert db.get_all_exercise_names() == ["Apple", "Mango", "Zebra"]
+
+
 # ── update_workout ───────────────────────────────────────────────