diff --git a/bincio/serve/server.py b/bincio/serve/server.py
index 9003d02..2c86469 100644
--- a/bincio/serve/server.py
+++ b/bincio/serve/server.py
@@ -517,38 +517,57 @@ async def admin_rebuild(
     return JSONResponse({"ok": True})
 
 
+def _wipe_user_activities(user_dir: Path) -> int:
+    """Delete all extracted activity files and caches for a user.
+
+    Removes activities/ (JSON + GeoJSON + timeseries), edits/, originals/,
+    _merged/, index.json, athlete.json, and the dedup cache.
+    Leaves the user directory itself intact (account remains in the DB).
+    Returns the number of files deleted.
+    """
+    import shutil
+    deleted = 0
+
+    for subdir in ("activities", "edits", "originals"):
+        d = user_dir / subdir
+        if d.exists():
+            for f in d.rglob("*"):
+                if f.is_file():
+                    deleted += 1
+            shutil.rmtree(d)
+
+    for name in ("_merged", ):
+        d = user_dir / name
+        if d.exists():
+            shutil.rmtree(d)
+
+    for name in ("index.json", "athlete.json", ".bincio_cache.json"):
+        f = user_dir / name
+        if f.exists():
+            f.unlink()
+            deleted += 1
+
+    return deleted
+
+
 @app.delete("/api/admin/users/{handle}/activities")
 async def admin_delete_activities(
     handle: str,
     bincio_session: Optional[str] = Cookie(default=None),
 ) -> JSONResponse:
-    """Delete all activity JSON files for a user and wipe the merged cache."""
+    """Delete all activity data for a user and wipe the merged cache."""
     _require_admin(bincio_session)
     user_dir = _get_data_dir() / handle
     if not user_dir.is_dir():
         raise HTTPException(404, f"No data directory for user '{handle}'")
 
-    deleted = 0
-    activities_dir = user_dir / "activities"
-    if activities_dir.is_dir():
-        for f in activities_dir.glob("*.json"):
-            f.unlink()
-            deleted += 1
-
-    # Wipe merged cache, top-level index, and dedup cache so re-uploads aren't blocked
-    import shutil
-    merged_dir = user_dir / "_merged"
-    if merged_dir.exists():
-        shutil.rmtree(merged_dir)
-    for name in ("index.json", ".bincio_cache.json"):
-        f = user_dir / name
-        if f.exists():
-            f.unlink()
-
+    deleted = _wipe_user_activities(user_dir)
     _trigger_rebuild(handle)
     return JSONResponse({"ok": True, "deleted": deleted})
 
 
+
+
 # ── Write API (ported from bincio edit, auth-gated) ───────────────────────────
 
 def _user_data_dir(handle: str) -> Path:
diff --git a/site/src/pages/admin/index.astro b/site/src/pages/admin/index.astro
index c67ac33..1789631 100644
--- a/site/src/pages/admin/index.astro
+++ b/site/src/pages/admin/index.astro
@@ -33,10 +33,11 @@ import Base from '../../layouts/Base.astro';
 
     <!-- Confirmation dialog -->
     <dialog id="confirm-dialog" class="rounded-xl bg-zinc-900 border border-zinc-700 p-6 text-white max-w-sm w-full backdrop:bg-black/60">
-      <p class="text-sm text-zinc-300 mb-5">Delete all activities for <strong id="confirm-handle" class="text-white"></strong>? This cannot be undone.</p>
+      <p class="text-sm text-zinc-300 mb-1">Reset all data for <strong id="confirm-handle" class="text-white"></strong>?</p>
+      <p class="text-xs text-zinc-500 mb-5">Removes all activities, originals, edits, and images. The account is kept. This cannot be undone.</p>
       <div class="flex gap-3 justify-end">
         <button id="confirm-cancel" class="px-4 py-2 rounded-lg text-sm bg-zinc-800 hover:bg-zinc-700 text-zinc-300 transition-colors">Cancel</button>
-        <button id="confirm-ok" class="px-4 py-2 rounded-lg text-sm bg-red-700 hover:bg-red-600 text-white font-medium transition-colors">Delete</button>
+        <button id="confirm-ok" class="px-4 py-2 rounded-lg text-sm bg-red-700 hover:bg-red-600 text-white font-medium transition-colors">Reset</button>
       </div>
     </dialog>
   </div>
@@ -124,7 +125,8 @@ import Base from '../../layouts/Base.astro';
               <button
                 class="delete-btn text-xs px-3 py-1.5 rounded-lg bg-zinc-800 hover:bg-red-900 hover:text-red-300 text-zinc-400 transition-colors"
                 data-handle="${u.handle}"
-              >Delete activities</button>
+                title="Wipe all activities, originals, edits and images — account is kept"
+              >Reset data</button>
             </div>
           </td>
         </tr>