feat: add SQL functions to compare and retrieve flow shapes

[jumski]

Add Flow Shape Comparison Utilities

This PR adds two new PostgreSQL functions to support flow shape validation:

1. pgflow._get_flow_shape(p_flow_slug text): Retrieves a flow's structure from the database as JSONB, matching the TypeScript FlowShape interface with steps, their types, and dependencies.

2. pgflow._compare_flow_shapes(p_local jsonb, p_db jsonb): Compares two flow shapes and returns an array of difference descriptions, mirroring the TypeScript compareFlowShapes() function logic.

The implementation includes comprehensive tests for both functions covering:

• Basic shape retrieval
• Map step type handling
• Multiple dependencies (sorted alphabetically)
• Nonexistent flow handling
• Matching shapes comparison
• Detecting differences in step count, slugs, types, and dependencies

These functions will enable validation of flow structures between client and server representations.

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[jumski]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
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• feat: add secure local development detection for flow compilation #473
• refactor: use Supabase service role key for worker authentication #472
• feat: include options in FlowShape for proper flow creation #471
• feat: add ensure-compiled endpoint to control plane server #467
• feat: add ensure_flow_compiled function with dev/prod mode support #466
• feat: add flow compilation utilities for creating flows from JSON shapes #465
• feat: add SQL functions to compare and retrieve flow shapes #464 👈 (View in Graphite)
• Setup Worker Startup Compilation Phase 1 #463
• main

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☁️ Nx Cloud last updated this comment at 2025-11-30 14:56:52 UTC

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• Branch: 11-30-feat_core_add_shape_extraction_and_comparison_functions
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