refactor: Add explicit pass statements to all abstract methods in database_base.py

[UtkarshMishra-Microsoft]

Purpose

Added explicit pass statements to every abstract method within DatabaseBase to maintain consistency and clarity in the abstract class definition.

Ensures all methods follow a uniform structure for better readability and easier future maintenance.

No behavioral or functional changes were introduced.

Improves code clarity for contributors implementing concrete subclasses later.

Does this introduce a breaking change?

• Yes
• No

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code

What to Check

Verify that the following are valid

• ...

Other Information