Updated default values in the database

[Sujanadh]

What type of PR is this? (check all applicable)

• 🍕 Feature
• 🐛 Bug Fix
• 📝 Documentation
• 🧑‍💻 Refactor
• ✅ Test
• 🤖 Build or CI
• ❓ Other (please specify)

Related Issue

• Issue No. Add defaults to base schema fields where appropriate #1337

Describe this PR

This PR updates the fmtm base database schema by adding default values wherever necessary at the database level instead of defining them using sqlalchemy.

Screenshots

SQL query to insert data in the user table without mentioning other fields where default values are set.

Result

Here, role, is_email_verified, is_expert , mapping_level , tasks_mapped, tasks_validated are auto-populated with default values.

Alternative Approaches Considered

Did you attempt any other approaches that are not documented in code?

Review Guide

Notes for the reviewer. How to test this change?

Checklist before requesting a review

• 📖 Read the FMTM Contributing Guide: https://github.com/hotosm/fmtm/blob/main/CONTRIBUTING.md
• 📖 Read the HOT Code of Conduct: https://docs.hotosm.org/code-of-conduct
• 👷‍♀️ Create small PRs. In most cases, this will be possible.
• ✅ Provide tests for your changes.
• 📝 Use descriptive commit messages.
• 📗 Update any related documentation and include any relevant screenshots.

[optional] What gif best describes this PR or how it makes you feel?

[spwoodcock]

This is excellent, but will only apply to a newly created db.

We probably need a migration file with a load of ALTER TABLE commands to update the field defaults + a revert migration would be good too!

[Sujanadh]

• Added migration file to update the existing tables to set their respective default values and to revert them.