# sahilkavathekar7070-cyber/streamlit_demo architecture

> Architecture diagram of the GitHub repository sahilkavathekar7070-cyber/streamlit_demo, generated by GitDiagram from its file tree, README and a sample of source files (last updated 2026-09-25). It is an AI-made overview: check details against the source.

- Interactive diagram: https://gitdiagram.com/sahilkavathekar7070-cyber/streamlit_demo
- Repository: https://github.com/sahilkavathekar7070-cyber/streamlit_demo

## Overview

This is a Streamlit railway-reservation application with booking, PNR search, cancellation, and administrative records as its main user workflows. The README describes fare calculation, validation, seat allocation, and CSV export; sampled code confirms the single-file application, SQLite connection and booking tables, seat-availability queries, booking persistence, and PNR lookup. The source excerpt is incomplete, so edges for unsampled workflow details rely on the README’s explicit architecture and capability descriptions; implementation details beyond that are not inferred.

Main entry points: [`app.py`](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py) (Booking processing), [`railway.db`](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/railway.db) (Railway database)

## Diagram (Mermaid)

```mermaid
flowchart TD

subgraph group_interface["User Interface"]
  node_streamlit_app["Streamlit application<br/>[app.py]"]
  node_booking_ui["Ticket booking form<br/>[app.py]"]
  node_search_ui["Booking search form<br/>[app.py]"]
  node_cancel_ui["Cancellation interface<br/>[app.py]"]
  node_dashboard["Dashboard and records<br/>[app.py]"]
  node_csv_export["CSV records export<br/>[app.py]"]
end

subgraph group_reservation["Reservation Workflows"]
  node_booking_logic["Booking processing<br/>[app.py]"]
  node_input_validation["Passenger validation<br/>[app.py]"]
  node_fare_calculation["Fare calculation<br/>[app.py]"]
  node_seat_management["Seat availability and allocation<br/>[app.py]"]
  node_pnr_generation["PNR generation<br/>[app.py]"]
  node_booking_search["PNR lookup<br/>[app.py]"]
  node_cancellation_logic["Cancellation and seat restoration<br/>[app.py]"]
end

subgraph group_storage["Persistent Data"]
  node_database_access["SQLite operations<br/>[app.py]"]
  node_sqlite_store[("Railway database<br/>[railway.db]")]
end

node_traveler(("Traveler or administrator"))

node_traveler -->|"uses"| node_streamlit_app
node_streamlit_app -->|"renders"| node_booking_ui
node_streamlit_app -->|"renders"| node_search_ui
node_streamlit_app -->|"renders"| node_cancel_ui
node_streamlit_app -->|"renders"| node_dashboard
node_booking_ui -->|"submits"| node_booking_logic
node_booking_logic -->|"validates"| node_input_validation
node_booking_logic -->|"calculates fare"| node_fare_calculation
node_booking_logic -->|"allocates seats"| node_seat_management
node_booking_logic -->|"generates PNR"| node_pnr_generation
node_booking_logic -->|"saves booking"| node_database_access
node_search_ui -->|"submits PNR"| node_booking_search
node_booking_search -->|"looks up"| node_database_access
node_cancel_ui -->|"finds booking"| node_booking_search
node_cancel_ui -->|"confirms cancellation"| node_cancellation_logic
node_cancellation_logic -->|"updates booking"| node_database_access
node_cancellation_logic -->|"restores seats"| node_seat_management
node_dashboard -->|"reads records"| node_database_access
node_dashboard -->|"offers download"| node_csv_export
node_database_access -->|"reads and writes"| node_sqlite_store
node_seat_management -->|"checks availability"| node_database_access

click node_streamlit_app "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_booking_ui "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_search_ui "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_cancel_ui "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_dashboard "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_csv_export "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_booking_logic "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_input_validation "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_fare_calculation "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_seat_management "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_pnr_generation "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_booking_search "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_cancellation_logic "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_database_access "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py"
click node_sqlite_store "https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/railway.db"

classDef toneNeutral fill:#f8fafc,stroke:#334155,stroke-width:1.5px,color:#0f172a
classDef toneBlue fill:#dbeafe,stroke:#2563eb,stroke-width:1.5px,color:#172554
classDef toneAmber fill:#fef3c7,stroke:#d97706,stroke-width:1.5px,color:#78350f
classDef toneMint fill:#dcfce7,stroke:#16a34a,stroke-width:1.5px,color:#14532d
classDef toneRose fill:#ffe4e6,stroke:#e11d48,stroke-width:1.5px,color:#881337
classDef toneIndigo fill:#e0e7ff,stroke:#4f46e5,stroke-width:1.5px,color:#312e81
classDef toneTeal fill:#ccfbf1,stroke:#0f766e,stroke-width:1.5px,color:#134e4a
class node_streamlit_app,node_booking_ui,node_search_ui,node_cancel_ui,node_dashboard,node_csv_export toneBlue
class node_booking_logic,node_input_validation,node_fare_calculation,node_seat_management,node_pnr_generation,node_booking_search,node_cancellation_logic toneAmber
class node_database_access,node_sqlite_store toneMint
class node_traveler toneIndigo
```

## Components

### User Interface

- [Streamlit application](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Ticket booking form](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Booking search form](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Cancellation interface](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Dashboard and records](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [CSV records export](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`

### Reservation Workflows

- [Booking processing](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Passenger validation](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Fare calculation](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Seat availability and allocation](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [PNR generation](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [PNR lookup](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Cancellation and seat restoration](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`

### Persistent Data

- [SQLite operations](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/app.py): `app.py`
- [Railway database](https://github.com/sahilkavathekar7070-cyber/streamlit_demo/blob/main/railway.db): `railway.db`

### Other components

- **Traveler or administrator**

## Connections

- Traveler or administrator → Streamlit application: uses
- Streamlit application → Ticket booking form: renders
- Streamlit application → Booking search form: renders
- Streamlit application → Cancellation interface: renders
- Streamlit application → Dashboard and records: renders
- Ticket booking form → Booking processing: submits
- Booking processing → Passenger validation: validates
- Booking processing → Fare calculation: calculates fare
- Booking processing → Seat availability and allocation: allocates seats
- Booking processing → PNR generation: generates PNR
- Booking processing → SQLite operations: saves booking
- Booking search form → PNR lookup: submits PNR
- PNR lookup → SQLite operations: looks up
- Cancellation interface → PNR lookup: finds booking
- Cancellation interface → Cancellation and seat restoration: confirms cancellation
- Cancellation and seat restoration → SQLite operations: updates booking
- Cancellation and seat restoration → Seat availability and allocation: restores seats
- Dashboard and records → SQLite operations: reads records
- Dashboard and records → CSV records export: offers download
- SQLite operations → Railway database: reads and writes
- Seat availability and allocation → SQLite operations: checks availability