Extend text length in statement table

[outmaneuver]

Related to #2

Extend the column length for 'text' and 'search_text' in the 'statement' table to 1000 characters.

• Abstract Models:

  • Update the max_length attribute of the text and search_text fields in the AbstractBaseStatement class to 1000 characters.
  • Add indexes to frequently queried fields in the AbstractBaseStatement class to improve query performance.
  • Add a custom validation method in the AbstractBaseStatement class to ensure data integrity and consistency.

• Migration:

  • Add a new migration file 0019_extend_text_length.py to update the column length for text and search_text in the statement table to 1000 characters.
  • Use the RunSQL operation instead of AlterField for efficiency.

• Constants:

  • Update STATEMENT_TEXT_MAX_LENGTH in constants.py to 1000 to reflect the new maximum length for the text and search_text fields.
  • Add more detailed comments explaining the purpose and usage of each constant.

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