Fix whitespace normalization to preserve SQL quoted strings in ERB templates

[sufleR]

Problem

The prepared_for_logs method (used for logging SQL queries) was incorrectly normalizing whitespace inside SQL quoted strings. The previous implementation in prepare_query used a simple regex pattern gsub(/(\n|\s)+/, ' ') that would:

1. Apply to the entire ERB template before rendering
2. Corrupt string literals that contained whitespace
3. Break multiline ERB code blocks (e.g., <% ... %>)

This caused issues with complex ERB templates that use multiline Ruby code blocks or contain SQL string literals with intentional whitespace.

Solution

This PR refactors the prepare_query method to:

1. Render ERB first, then normalize whitespace on the resulting SQL
2. Preserve quoted string content using a sophisticated regex that matches:
   • Single-quoted strings: '...'
   • Double-quoted strings: "..."
   • Whitespace outside quotes (which gets normalized)
3. Only capture and replace whitespace that's not inside quotes

The new pattern /'(?:[^'\\]|\\.)*'|"(?:[^"\\]|\\.)*"|(\s+)/ properly handles:

• Escaped quotes inside strings
• Nested quotes
• Multiline strings
• ERB code blocks that span multiple lines

Changes

• lib/sql_query.rb: Refactored prepare_query method with improved whitespace handling
• spec/spec_helper.rb: Simplified database configuration for consistent local/CI testing
• spec/sql_query_spec.rb: Added comprehensive tests for multiline ERB templates
• spec/sql_queries/multiline_erb.sql.erb: New test fixture demonstrating multiline ERB usage

Why This Matters

This fix is critical because:

1. Data Integrity: Prevents corruption of SQL string literals in logs
2. Template Flexibility: Allows developers to use multiline ERB code blocks for cleaner, more maintainable SQL templates
3. Debugging: Ensures logged SQL accurately represents what's being executed
4. Backwards Compatible: Doesn't change behavior for simple templates, only fixes broken edge cases

Testing

All existing tests pass, plus new tests verify:

• Multiline ERB blocks render correctly
• Quoted strings with whitespace are preserved
• Prepared logs still produce clean, single-line output
• No syntax errors with complex ERB templates

bundle exec rspec
# 27 examples, 0 failures
# Line Coverage: 98.67%