fix: include conversation history in SQL prompt template

[Br1an67]

• Closes Agent ignores Conversation History: Missing placeholders in generate_python_code_with_sql.tmpl #1856
• Tests added and passed if fixing a bug or adding a new feature.
• All code checks passed.

Summary

The SQL code generation template (generate_python_code_with_sql.tmpl) was missing the previous conversation history block that the Python template already includes. Multi-turn follow-up queries in SQL mode produced incorrect results because the LLM had no visibility into prior questions and answers.

Changes

Added a PREVIOUS CONVERSATION block to the SQL template, gated behind context.memory.count() > 1, mirroring the existing behavior in generate_python_code.tmpl.

Files changed:

• pandasai/core/prompts/templates/generate_python_code_with_sql.tmpl — added history rendering block
• tests/unit_tests/core/prompts/test_generate_python_code_with_sql_prompt.py — added tests for history rendering

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Important

Adds conversation history to SQL prompt template for multi-turn queries, with tests to verify functionality.

• Behavior:
  • Added PREVIOUS CONVERSATION block to generate_python_code_with_sql.tmpl, visible if context.memory.count() > 1.
  • Ensures SQL prompt template includes conversation history for multi-turn queries.
• Tests:
  • Added test_template_includes_previous_conversation to verify history inclusion in test_generate_python_code_with_sql_prompt.py.
  • Added test_template_no_previous_conversation_for_single_message to ensure single-message memory does not show history.

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