telemetría: instalaciones únicas con id anónimo de instalación

Nueva tabla telemetry_active(install_id, day) (create_all la crea). add_telemetry
hace upsert (install_id, day) si viene install_id. El summary añade installsTotal
(únicas de siempre), installsActive (en el periodo) y dauToday. Tests: dos ids
únicos + uno duplicado → 2 únicas.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

main.py

@@ -21,7 +21,7 @@ def clamp_limit(limit: int) -> int:
 
 import off
 from db import Base, engine, get_db
-from models import Food, Recipe, TelemetryDaily
+from models import Food, Recipe, TelemetryDaily, TelemetryActive
 
 
 # Columnas añadidas a `recipes` después de la v1 (id/name/servings/items). En
@@ -278,6 +278,7 @@ def delete_cookbook(author_id: str, db: Session = Depends(get_db)):
 class TelemetryIn(BaseModel):
     day: str
     app_version: str | None = None
+    install_id: str | None = None
     active_modules: list[str] = []
     opens_by_module: dict[str, int] = {}
     seconds_by_module: dict[str, int] = {}
@@ -337,6 +338,12 @@ def add_telemetry(body: TelemetryIn, db: Session = Depends(get_db)):
         row.active = (row.active or 0) + delta["active"]
         row.opens = (row.opens or 0) + delta["opens"]
         row.seconds = (row.seconds or 0) + delta["seconds"]
+
+    # Presencia (instalación, día) para contar instalaciones únicas.
+    install_id = (body.install_id or "").strip()[:64]
+    if install_id and db.get(TelemetryActive, (install_id, day)) is None:
+        db.add(TelemetryActive(install_id=install_id, day=day))
+
     db.commit()
     return {"ok": True}
 
@@ -372,7 +379,26 @@ def telemetry_summary(days: int = 30, db: Session = Depends(get_db)):
             "seconds": int(seconds or 0),
         })
     modules.sort(key=lambda x: x["opens"], reverse=True)
-    return {"sinceDays": days, "submissions": submissions, "modules": modules}
+
+    # Instalaciones únicas (por install_id): total, activas en el periodo y hoy.
+    today = date.today().isoformat()
+    installs_total = db.query(
+        func.count(func.distinct(TelemetryActive.install_id))).scalar() or 0
+    installs_active = db.query(
+        func.count(func.distinct(TelemetryActive.install_id))
+    ).filter(TelemetryActive.day >= cutoff).scalar() or 0
+    dau_today = db.query(
+        func.count(func.distinct(TelemetryActive.install_id))
+    ).filter(TelemetryActive.day == today).scalar() or 0
+
+    return {
+        "sinceDays": days,
+        "submissions": submissions,
+        "installsTotal": int(installs_total),
+        "installsActive": int(installs_active),
+        "dauToday": int(dau_today),
+        "modules": modules,
+    }
 
 
 @app.post("/recipes")