Fix bugs in SubjectDBHelper.java

[sweep-ai-deprecated]

Description

This PR fixes several bugs in the SubjectDBHelper.java file in the TODORO application. The bugs include a missing closing parenthesis in the SQL command for creating the database table, an incorrect SQL command for dropping the table in the onUpgrade() method, and improper management of database operations.

Summary

• Added a closing parenthesis to the SQL command in the onCreate() method to fix a syntax error.
• Changed the SQL command in the onUpgrade() method from "drop table if exist" to "drop table if exists" to fix an error when upgrading the database.
• Refactored the database operations to open the database once, perform all necessary operations, and then close it to prevent memory leaks and other issues.

Fixes #1.

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