Enhance Documentation for PostgreSQL Setup Instructions

[loxneshow2003]

Description

The documentation provides instructions for installing Metis with PostgreSQL (pgvector) backend support, but it lacks detailed steps for setting up and configuring PostgreSQL itself. This gap may lead to confusion for users who are not familiar with setting up PostgreSQL databases.

Suggested Improvements

1. Include Prerequisites: Add a section that outlines the prerequisites for installing PostgreSQL, such as required operating system packages and versions.
2. Step-by-Step Setup: Provide a step-by-step guide to set up PostgreSQL, including creating a database and user, as well as configuring any necessary extensions for pgvector.
3. Configuration Options: Discuss common configuration options that may be beneficial for users, such as connection settings and performance tuning.
4. Common Troubleshooting: Include a section on troubleshooting common issues that users may encounter when setting up PostgreSQL with Metis.

By enhancing the documentation with these elements, users will have a smoother experience when integrating the PostgreSQL backend with Metis.

[mpekatsoula]

Hi @loxneshow2003 thanks for your suggestion. We're currently thinking to drop PostgreSQL support as there are some limitations compared to chromaDB and large embedding sizes.