chore(low-code): remove unused SubstreamPartitionRouter._migrate_child_state_to_parent_state

[Serhii Lazebnyi (lazebnyi)]

What

Remove SubstreamPartitionRouter._migrate_child_state_to_parent_state — it has no callers anywhere in the codebase.

Why

It's dead code left over from the pre-concurrent implementation: parent state is now seeded at stream-construction time in ModelToComponentFactory._instantiate_parent_stream_state_manager. Leaving it around is misleading — the analysis in #1067 anchored on it as a suspected root cause, and #1079 independently noted it has no callers.

Test

• grep -rn _migrate_child_state_to_parent_state — no remaining references (production or tests)
• pytest unit_tests/sources/declarative/partition_routers/ — 68 passed

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Review details

⚙️ Run configuration

Configuration used: Repository UI

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Run ID: 99ea5d3c-813f-4cbf-b8f1-e200c58961b9

📥 Commits

Reviewing files that changed from the base of the PR and between e79d50e and 44992d3.

📒 Files selected for processing (1)

• airbyte_cdk/sources/declarative/partition_routers/substream_partition_router.py

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You can test this version of the CDK using the following:

# Run the CLI from this branch:
uvx 'git+https://github.com/airbytehq/airbyte-python-cdk.git@lazebnyi/remove-dead-migrate-child-state#egg=airbyte-python-cdk[dev]' --help

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✅ Devin Review: No Issues Found

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PyTest Results (Fast)

4 158 tests  ±0   4 146 ✅ ±0   7m 49s ⏱️ +2s
    1 suites ±0      12 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 44992d3. ± Comparison against base commit e79d50e.

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PyTest Results (Full)

4 161 tests   4 149 ✅  12m 34s ⏱️
    1 suites     12 💤
    1 files        0 ❌

Results for commit 44992d3.