commit 2fedc1ac18f67301ab8f329700687725ca0c4799
Author: alex <alex@buhit.uz>
Date:   Thu Feb 26 19:18:58 2026 +0500

    init app

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diff --git a/__pycache__/models.cpython-313.pyc b/__pycache__/models.cpython-313.pyc
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diff --git a/__pycache__/schemas.cpython-313.pyc b/__pycache__/schemas.cpython-313.pyc
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diff --git a/crud.py b/crud.py
new file mode 100644
index 0000000..b828eda
--- /dev/null
+++ b/crud.py
@@ -0,0 +1,84 @@
+from sqlalchemy.orm import Session
+import models
+import schemas
+
+# Tasks
+def get_task(db: Session, task_id: int, telegram_user_id: str = None):
+    query = db.query(models.Task).filter(models.Task.id == task_id)
+    if telegram_user_id:
+        query = query.filter(models.Task.telegram_user_id == telegram_user_id)
+    return query.first()
+
+def get_tasks(db: Session, skip: int = 0, limit: int = 100, telegram_user_id: str = None, status: models.TaskStatus = None):
+    query = db.query(models.Task)
+    if telegram_user_id:
+        query = query.filter(models.Task.telegram_user_id == telegram_user_id)
+    if status:
+        query = query.filter(models.Task.status == status)
+    return query.offset(skip).limit(limit).all()
+
+def create_task(db: Session, task: schemas.TaskCreate):
+    db_task = models.Task(**task.model_dump())
+    db.add(db_task)
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+def update_task(db: Session, task_id: int, task_update: schemas.TaskUpdate, telegram_user_id: str = None):
+    db_task = get_task(db, task_id, telegram_user_id)
+    if not db_task:
+        return None
+    
+    update_data = task_update.model_dump(exclude_unset=True)
+    for key, value in update_data.items():
+        setattr(db_task, key, value)
+    
+    db.commit()
+    db.refresh(db_task)
+    return db_task
+
+def delete_task(db: Session, task_id: int, telegram_user_id: str = None):
+    db_task = get_task(db, task_id, telegram_user_id)
+    if db_task:
+        db.delete(db_task)
+        db.commit()
+        return True
+    return False
+
+# Reminders
+def get_reminder(db: Session, reminder_id: int):
+    return db.query(models.Reminder).filter(models.Reminder.id == reminder_id).first()
+
+def get_reminders(db: Session, task_id: int = None, skip: int = 0, limit: int = 100):
+    query = db.query(models.Reminder)
+    if task_id:
+        query = query.filter(models.Reminder.task_id == task_id)
+    return query.offset(skip).limit(limit).all()
+
+def create_reminder(db: Session, reminder: schemas.ReminderCreate):
+    db_reminder = models.Reminder(**reminder.model_dump())
+    db.add(db_reminder)
+    db.commit()
+    db.refresh(db_reminder)
+    return db_reminder
+
+def update_reminder(db: Session, reminder_id: int, reminder_update: schemas.ReminderUpdate):
+    db_reminder = get_reminder(db, reminder_id)
+    if not db_reminder:
+        return None
+    
+    update_data = reminder_update.model_dump(exclude_unset=True)
+    for key, value in update_data.items():
+        setattr(db_reminder, key, value)
+        
+    db.commit()
+    db.refresh(db_reminder)
+    return db_reminder
+
+def delete_reminder(db: Session, reminder_id: int):
+    db_reminder = get_reminder(db, reminder_id)
+    if db_reminder:
+        db.delete(db_reminder)
+        db.commit()
+        return True
+    return False
diff --git a/database.py b/database.py
new file mode 100644
index 0000000..aa18af6
--- /dev/null
+++ b/database.py
@@ -0,0 +1,19 @@
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, declarative_base
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///./tasks.db"
+# connect_args={"check_same_thread": False} is required for SQLite in FastAPI
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+Base = declarative_base()
+
+# Dependency
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
diff --git a/int.txt b/int.txt
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index 0000000..601024e
--- /dev/null
+++ b/int.txt
@@ -0,0 +1,35 @@
+Task and Reminder Manager Backend - Walkthrough
+What Was Accomplished
+I successfully developed the backend infrastructure for the Task and Reminder Manager application, exposing a REST API built with FastAPI that meets the user requirements. I set up the database, models, and endpoints necessary to manage tasks and reminders.
+
+Key Changes Made
+Application Structure: Created a modular FastAPI backend (
+main.py
+, 
+database.py
+, 
+models.py
+, 
+schemas.py
+, 
+crud.py
+).
+Database System: Implemented SQLite functionality via SQLAlchemy, with specific models adapted to track user execution and messaging contexts.
+Designed 
+Task
+ model containing the telegram_user_id and the status (pending, completed).
+Designed 
+Reminder
+ model tightly coupled to 
+Task
+, capable of deep tracking: trigger_time, recurrence_type (daily, custom, etc.), and notification toggles (notify_push, notify_telegram).
+Data Validation: Built Pydantic schemas representing creation payloads, updates, and serialized API responses to ensure safe data boundaries.
+API Endpoints: Built isolated routers to handle operations across tasks (
+routers/tasks.py
+) and reminders (
+routers/reminders.py
+). Examples include retrieving tasks specific to a telegram_user_id, handling task completion logic (via PUT endpoint updates), and constructing sophisticated reminders.
+Validation Results
+Verified that all necessary dependencies (including updated Python 3.13-compatible versions) install inside a valid virtual environment.
+Verified successful Uvicorn server boot without errors.
+Fired test API requests to generate entries into SQLite, returning 200 success responses. The system's CRUD functionality handles database commits successfully and retrieves nested relationships gracefully.
\ No newline at end of file
diff --git a/main.py b/main.py
new file mode 100644
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--- /dev/null
+++ b/main.py
@@ -0,0 +1,34 @@
+from fastapi import FastAPI
+from fastapi.middleware.cors import CORSMiddleware
+import models
+from database import engine
+from routers import tasks, reminders
+
+# Create database tables
+models.Base.metadata.create_all(bind=engine)
+
+app = FastAPI(
+    title="Task Manager API",
+    description="Backend API for managing tasks and reminders for Web and Telegram.",
+    version="1.0.0"
+)
+
+# CORS configuration
+origins = [
+    "*" # Adjust this in production
+]
+app.add_middleware(
+    CORSMiddleware,
+    allow_origins=origins,
+    allow_credentials=True,
+    allow_methods=["*"],
+    allow_headers=["*"],
+)
+
+# Include routers
+app.include_router(tasks.router)
+app.include_router(reminders.router)
+
+@app.get("/")
+def read_root():
+    return {"message": "Welcome to the Task Manager API"}
diff --git a/models.py b/models.py
new file mode 100644
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--- /dev/null
+++ b/models.py
@@ -0,0 +1,46 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey, Enum
+from sqlalchemy.orm import relationship
+from sqlalchemy.sql import func
+import enum
+from database import Base
+
+class TaskStatus(str, enum.Enum):
+    pending = "pending"
+    completed = "completed"
+
+class RecurrenceType(str, enum.Enum):
+    none = "none"
+    daily = "daily"
+    weekly = "weekly"
+    monthly = "monthly"
+    custom = "custom"
+
+class Task(Base):
+    __tablename__ = "tasks"
+
+    id = Column(Integer, primary_key=True, index=True)
+    title = Column(String, index=True, nullable=False)
+    description = Column(String, nullable=True)
+    telegram_user_id = Column(String, index=True, nullable=False)
+    status = Column(Enum(TaskStatus), default=TaskStatus.pending, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+    reminders = relationship("Reminder", back_populates="task", cascade="all, delete-orphan")
+
+class Reminder(Base):
+    __tablename__ = "reminders"
+
+    id = Column(Integer, primary_key=True, index=True)
+    task_id = Column(Integer, ForeignKey("tasks.id"), nullable=False)
+    trigger_time = Column(DateTime(timezone=True), nullable=False)
+    recurrence_type = Column(Enum(RecurrenceType), default=RecurrenceType.none, nullable=False)
+    recurrence_interval = Column(Integer, nullable=True) # E.g. every X minutes/hours if custom
+    remind_count_limit = Column(Integer, default=0, nullable=False) # 0 for infinite
+    remind_count_current = Column(Integer, default=0, nullable=False)
+    notify_push = Column(Boolean, default=False, nullable=False)
+    notify_telegram = Column(Boolean, default=False, nullable=False)
+    created_at = Column(DateTime(timezone=True), server_default=func.now())
+    updated_at = Column(DateTime(timezone=True), server_default=func.now(), onupdate=func.now())
+
+    task = relationship("Task", back_populates="reminders")
diff --git a/pip_install.log b/pip_install.log
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--- /dev/null
+++ b/pip_install.log
@@ -0,0 +1,60 @@
+Collecting fastapi==0.110.0 (from -r requirements.txt (line 1))
+  Using cached fastapi-0.110.0-py3-none-any.whl.metadata (25 kB)
+Collecting uvicorn==0.27.1 (from -r requirements.txt (line 2))
+  Using cached uvicorn-0.27.1-py3-none-any.whl.metadata (6.3 kB)
+Collecting sqlalchemy==2.0.28 (from -r requirements.txt (line 3))
+  Using cached SQLAlchemy-2.0.28-py3-none-any.whl.metadata (9.6 kB)
+Collecting pydantic==2.6.4 (from -r requirements.txt (line 4))
+  Using cached pydantic-2.6.4-py3-none-any.whl.metadata (85 kB)
+Collecting pydantic-settings==2.2.1 (from -r requirements.txt (line 5))
+  Using cached pydantic_settings-2.2.1-py3-none-any.whl.metadata (3.1 kB)
+Collecting starlette<0.37.0,>=0.36.3 (from fastapi==0.110.0->-r requirements.txt (line 1))
+  Using cached starlette-0.36.3-py3-none-any.whl.metadata (5.9 kB)
+Collecting typing-extensions>=4.8.0 (from fastapi==0.110.0->-r requirements.txt (line 1))
+  Using cached typing_extensions-4.15.0-py3-none-any.whl.metadata (3.3 kB)
+Collecting annotated-types>=0.4.0 (from pydantic==2.6.4->-r requirements.txt (line 4))
+  Using cached annotated_types-0.7.0-py3-none-any.whl.metadata (15 kB)
+Collecting pydantic-core==2.16.3 (from pydantic==2.6.4->-r requirements.txt (line 4))
+  Using cached pydantic_core-2.16.3.tar.gz (368 kB)
+  Installing build dependencies: started
+  Installing build dependencies: finished with status 'done'
+  Getting requirements to build wheel: started
+  Getting requirements to build wheel: finished with status 'done'
+  Installing backend dependencies: started
+  Installing backend dependencies: finished with status 'done'
+  Preparing metadata (pyproject.toml): started
+  Preparing metadata (pyproject.toml): finished with status 'error'
+  error: subprocess-exited-with-error
+  
+  Preparing metadata (pyproject.toml) did not run successfully.
+  exit code: 1
+  
+  [14 lines of output]
+  Python reports SOABI: cp313-win_amd64
+  Computed rustc target triple: x86_64-pc-windows-msvc
+  Installation directory: C:\Users\patro\AppData\Local\puccinialin\puccinialin\Cache
+  Rustup already downloaded
+  Installing rust to C:\Users\patro\AppData\Local\puccinialin\puccinialin\Cache\rustup
+  warn: installing msvc toolchain without its prerequisites
+  error: could not read metadata for file: 'C:\Users\patro\AppData\Local\puccinialin\puccinialin\Cache\rustup-init\rustup-init.exe': ╨б╨╕╤Б╤В╨╡╨╝╨╡ ╨╜╨╡ ╤Г╨┤╨░╨╡╤В╤Б╤П ╨╜╨░╨╣╤В╨╕ ╤Г╨║╨░╨╖╨░╨╜╨╜╤Л╨╣ ╨┐╤Г╤В╤М. (os error 3)
+  
+  Cargo, the Rust package manager, is not installed or is not on PATH.
+  This package requires Rust and Cargo to compile extensions. Install it through
+  the system's package manager or via https://rustup.rs/
+  
+  Checking for Rust toolchain....
+  Rust not found, installing into a temporary directory
+  [end of output]
+  
+  note: This error originates from a subprocess, and is likely not a problem with pip.
+
+[notice] A new release of pip is available: 25.3 -> 26.0.1
+[notice] To update, run: G:\CodeAssistent\task\api\task-api\.venv\Scripts\python.exe -m pip install --upgrade pip
+error: metadata-generation-failed
+
+Encountered error while generating package metadata.
+
+pydantic-core
+
+note: This is an issue with the package mentioned above, not pip.
+hint: See above for details.
diff --git a/requirements.txt b/requirements.txt
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+++ b/requirements.txt
@@ -0,0 +1,5 @@
+fastapi
+uvicorn
+sqlalchemy
+pydantic
+pydantic-settings
diff --git a/routers/__pycache__/reminders.cpython-313.pyc b/routers/__pycache__/reminders.cpython-313.pyc
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diff --git a/routers/__pycache__/tasks.cpython-313.pyc b/routers/__pycache__/tasks.cpython-313.pyc
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diff --git a/routers/reminders.py b/routers/reminders.py
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--- /dev/null
+++ b/routers/reminders.py
@@ -0,0 +1,53 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from typing import List
+
+import crud
+import models
+import schemas
+from database import get_db
+
+router = APIRouter(
+    prefix="/reminders",
+    tags=["reminders"]
+)
+
+@router.post("/", response_model=schemas.Reminder)
+def create_reminder(reminder: schemas.ReminderCreate, db: Session = Depends(get_db)):
+    # Verify task exists
+    db_task = crud.get_task(db, task_id=reminder.task_id)
+    if not db_task:
+        raise HTTPException(status_code=404, detail="Task not found")
+        
+    return crud.create_reminder(db=db, reminder=reminder)
+
+@router.get("/", response_model=List[schemas.Reminder])
+def read_reminders(
+    skip: int = 0, 
+    limit: int = 100, 
+    task_id: int = Query(None, description="Filter by Task ID"),
+    db: Session = Depends(get_db)
+):
+    reminders = crud.get_reminders(db, skip=skip, limit=limit, task_id=task_id)
+    return reminders
+
+@router.get("/{reminder_id}", response_model=schemas.Reminder)
+def read_reminder(reminder_id: int, db: Session = Depends(get_db)):
+    db_reminder = crud.get_reminder(db, reminder_id=reminder_id)
+    if db_reminder is None:
+        raise HTTPException(status_code=404, detail="Reminder not found")
+    return db_reminder
+
+@router.put("/{reminder_id}", response_model=schemas.Reminder)
+def update_reminder_endpoint(reminder_id: int, reminder: schemas.ReminderUpdate, db: Session = Depends(get_db)):
+    db_reminder = crud.update_reminder(db, reminder_id=reminder_id, reminder_update=reminder)
+    if db_reminder is None:
+        raise HTTPException(status_code=404, detail="Reminder not found")
+    return db_reminder
+
+@router.delete("/{reminder_id}")
+def delete_reminder_endpoint(reminder_id: int, db: Session = Depends(get_db)):
+    success = crud.delete_reminder(db, reminder_id=reminder_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Reminder not found")
+    return {"message": "Reminder successfully deleted"}
diff --git a/routers/tasks.py b/routers/tasks.py
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--- /dev/null
+++ b/routers/tasks.py
@@ -0,0 +1,49 @@
+from fastapi import APIRouter, Depends, HTTPException, Query
+from sqlalchemy.orm import Session
+from typing import List
+
+import crud
+import models
+import schemas
+from database import get_db
+
+router = APIRouter(
+    prefix="/tasks",
+    tags=["tasks"]
+)
+
+@router.post("/", response_model=schemas.Task)
+def create_task(task: schemas.TaskCreate, db: Session = Depends(get_db)):
+    return crud.create_task(db=db, task=task)
+
+@router.get("/", response_model=List[schemas.Task])
+def read_tasks(
+    skip: int = 0, 
+    limit: int = 100, 
+    telegram_user_id: str = Query(None, description="Filter by Telegram User ID"),
+    status: models.TaskStatus = Query(None, description="Filter by task status"),
+    db: Session = Depends(get_db)
+):
+    tasks = crud.get_tasks(db, skip=skip, limit=limit, telegram_user_id=telegram_user_id, status=status)
+    return tasks
+
+@router.get("/{task_id}", response_model=schemas.Task)
+def read_task(task_id: int, telegram_user_id: str = Query(None, description="Telegram User ID for authorization"), db: Session = Depends(get_db)):
+    db_task = crud.get_task(db, task_id=task_id, telegram_user_id=telegram_user_id)
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found")
+    return db_task
+
+@router.put("/{task_id}", response_model=schemas.Task)
+def update_task_endpoint(task_id: int, task: schemas.TaskUpdate, telegram_user_id: str = Query(None, description="Telegram User ID for authorization"), db: Session = Depends(get_db)):
+    db_task = crud.update_task(db, task_id=task_id, task_update=task, telegram_user_id=telegram_user_id)
+    if db_task is None:
+        raise HTTPException(status_code=404, detail="Task not found or you don't have access")
+    return db_task
+
+@router.delete("/{task_id}")
+def delete_task_endpoint(task_id: int, telegram_user_id: str = Query(None, description="Telegram User ID for authorization"), db: Session = Depends(get_db)):
+    success = crud.delete_task(db, task_id=task_id, telegram_user_id=telegram_user_id)
+    if not success:
+        raise HTTPException(status_code=404, detail="Task not found or you don't have access")
+    return {"message": "Task successfully deleted"}
diff --git a/schemas.py b/schemas.py
new file mode 100644
index 0000000..aa9e114
--- /dev/null
+++ b/schemas.py
@@ -0,0 +1,60 @@
+from pydantic import BaseModel, Field
+from datetime import datetime
+from typing import Optional, List
+from models import TaskStatus, RecurrenceType
+
+# Reminder Schemas
+class ReminderBase(BaseModel):
+    trigger_time: datetime
+    recurrence_type: RecurrenceType = RecurrenceType.none
+    recurrence_interval: Optional[int] = None
+    remind_count_limit: int = 0
+    notify_push: bool = False
+    notify_telegram: bool = False
+
+class ReminderCreate(ReminderBase):
+    task_id: int
+
+class ReminderUpdate(BaseModel):
+    trigger_time: Optional[datetime] = None
+    recurrence_type: Optional[RecurrenceType] = None
+    recurrence_interval: Optional[int] = None
+    remind_count_limit: Optional[int] = None
+    remind_count_current: Optional[int] = None
+    notify_push: Optional[bool] = None
+    notify_telegram: Optional[bool] = None
+
+class Reminder(ReminderBase):
+    id: int
+    task_id: int
+    remind_count_current: int
+    created_at: datetime
+    updated_at: datetime
+
+    class Config:
+        from_attributes = True
+
+
+# Task Schemas
+class TaskBase(BaseModel):
+    title: str
+    description: Optional[str] = None
+    telegram_user_id: str
+
+class TaskCreate(TaskBase):
+    pass
+
+class TaskUpdate(BaseModel):
+    title: Optional[str] = None
+    description: Optional[str] = None
+    status: Optional[TaskStatus] = None
+
+class Task(TaskBase):
+    id: int
+    status: TaskStatus
+    created_at: datetime
+    updated_at: datetime
+    reminders: List[Reminder] = []
+
+    class Config:
+        from_attributes = True
diff --git a/tasks.db b/tasks.db
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