import streamlit as st

st.markdown(
    """
# Physical Database Verification Documentation

## 1. Objective
Display the current physical database reference used by the app.

## 2. When to use this tool
Use this page when you need to inspect the latest physical database content before validation tasks.

## 3. Input files and accepted formats
No user upload is required.
The page reads local file:
- `physical_db/physical_database.csv`

## 4. Required columns/fields
No fixed schema is enforced by this page. It displays the CSV as-is.

## 5. Step-by-step usage
1. Open `Apps > Physical Database Verification`.
2. Click `Show actual physical database`.
3. Review the displayed table.

## 6. Outputs generated
- data table rendered from `physical_database.csv`

## 7. Frequent errors and fixes
- File not found warning.
  - Fix: ensure `physical_db/physical_database.csv` exists in repository.
- Empty table.
  - Fix: verify CSV has data rows and valid delimiter.
- Parsing issue.
  - Fix: confirm CSV encoding and structure.

## 8. Minimal reproducible example
- Input: existing `physical_db/physical_database.csv`
- Action: click show button.
- Expected result: full CSV displayed as Streamlit dataframe.

## 9. Known limitations
- Read-only page (no edit/upload flow).
- No filtering/export controls in current implementation.
- Depends entirely on local file availability.

## 10. Version and update date
- Documentation version: 1.0
- Last update: 2026-02-23
"""
)