seo improvement and updated notifs

backend/routers/notifications.py

@@ -0,0 +1,78 @@
+"""Notification routes — FCM token registration and reminder settings."""
+from fastapi import APIRouter, HTTPException
+from db import get_database
+from pydantic import BaseModel
+from typing import Optional
+from bson import ObjectId
+from bson.errors import InvalidId
+from datetime import datetime
+
+router = APIRouter()
+
+
+class FcmTokenRequest(BaseModel):
+    userId: str
+    fcmToken: str
+
+
+class ReminderSettingsRequest(BaseModel):
+    time: Optional[str] = None      # "HH:MM" in 24-hour format
+    enabled: bool
+    timezone: Optional[str] = None  # IANA timezone, e.g. "Asia/Kolkata"
+
+
+@router.post("/fcm-token", response_model=dict)
+async def register_fcm_token(body: FcmTokenRequest):
+    """
+    Register (or refresh) an FCM device token for a user.
+    Stores unique tokens per user — duplicate tokens are ignored.
+    """
+    db = get_database()
+
+    try:
+        user_oid = ObjectId(body.userId)
+    except InvalidId:
+        raise HTTPException(status_code=400, detail="Invalid user ID")
+
+    user = db.users.find_one({"_id": user_oid})
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    # Add token to set (avoid duplicates)
+    db.users.update_one(
+        {"_id": user_oid},
+        {
+            "$addToSet": {"fcmTokens": body.fcmToken},
+            "$set": {"updatedAt": datetime.utcnow()},
+        }
+    )
+    return {"message": "FCM token registered"}
+
+
+@router.put("/reminder/{user_id}", response_model=dict)
+async def update_reminder(user_id: str, settings: ReminderSettingsRequest):
+    """
+    Save or update daily reminder settings for a user.
+    """
+    db = get_database()
+
+    try:
+        user_oid = ObjectId(user_id)
+    except InvalidId:
+        raise HTTPException(status_code=400, detail="Invalid user ID")
+
+    user = db.users.find_one({"_id": user_oid})
+    if not user:
+        raise HTTPException(status_code=404, detail="User not found")
+
+    reminder_update: dict = {"reminder.enabled": settings.enabled}
+    if settings.time is not None:
+        reminder_update["reminder.time"] = settings.time
+    if settings.timezone is not None:
+        reminder_update["reminder.timezone"] = settings.timezone
+
+    db.users.update_one(
+        {"_id": user_oid},
+        {"$set": {**reminder_update, "updatedAt": datetime.utcnow()}}
+    )
+    return {"message": "Reminder settings updated"}