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feat(postgres): add pg_partman partition support (#43)
* feat(postgres): add pg_partman partition support Add PostgreSQL partition and pg_partman support with dialect, expression, protocol, mixin, provider, and test updates. Also apply ruff formatting/lint cleanup across the current change set and add low-risk backend signature annotations. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(test): align partition tests with public protocol API Update partition value security tests to exercise the public format_partition_value expression path instead of the removed _format_partition_value helper. Declare supports_table_partitioning in PostgresTableSupport so the protocol conformance reverse coverage matches PostgresTableMixin. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(postgres): avoid table and partition protocol overlap Remove supports_table_partitioning from PostgresTableMixin so the partition capability remains owned by PartitionSupport and PostgresPartitionMixin. This keeps PostgreSQL protocol interfaces non-overlapping while preserving dialect support through the partition mixin. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * refactor(postgres): separate table and partition capabilities Move PostgreSQL implementations of generic PartitionSupport capability methods into PostgresPartitionMixin and ensure that mixin takes precedence over the generic PartitionMixin in the dialect MRO. Keep PostgresTableMixin focused on table capabilities only, and move partition feature detection coverage from table tests into DDL protocol and partition mixin tests. Explicitly include PartitionSupport in the protocol conformance checks to document the inheritance boundary. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * refactor(postgres): expressionize partition operation helpers Disable the Python 3.15 experimental workflow job until the beta toolchain stabilizes. Move pg_partman part_config cleanup into a dedicated expression and formatter, then update partition operation tests to use expression helpers for DDL and pg_partman operations instead of hand-built SQL. Validation queries remain raw SQL because they inspect PostgreSQL runtime metadata and routing behavior directly. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * feat(postgres): align partition capability mapping Add PostgreSQL partition metadata query expression and align generic partition capability methods with PostgreSQL declarative partitioning. Update provider and tests to use Expression-Dialect generated SQL for partition metadata, truncate, and drop paths. Also update PR template links to repository-local .claude rule documents. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(partition): add production time partition operation scenarios Add production-style PostgreSQL time partition scenarios covering microsecond boundaries, future partition preparation, continuous partition pruning, index usage, metadata changes, and cold archival via DETACH PARTITION. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * fix(ddl): generate DEFAULT partition clauses correctly Fix PostgreSQL DEFAULT partition DDL by omitting FOR VALUES for DEFAULT RANGE and LIST partitions. Also add expression and real backend coverage for DEFAULT partition maintenance and pg_partman configuration maintenance. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * test(query): add eager loading and split sync/async relation with bridge files - Add 5 eager loading test bridge files (one-to-one import) - Split test_relations_with.py into sync/async bridge files - Remove old combined test_relations_with.py bridge - Remove partition.interfaces dependency from provider registry - Fix async_blog_fixtures to import AsyncUser from async_models for fixture parity Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * feat(provider): implement setup_profile_fixtures for Postgres sync/async - Add setup_profile_fixtures() and setup_async_profile_fixtures() to Postgres QueryProvider - Create profiles.sql schema with FK reference to users table - Add bridge files for eager_loading_scenarios_sync/async tests Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> * refactor(dialect): split mixins into directory-based modules * fix(ci): remove bridge file referencing non-existent testsuite module test_eager_loading_scenarios.py imported rhosocial.activerecord.testsuite.feature.query.test_eager_loading_scenarios which does not exist in the testsuite's release/v1.0.0.dev15 branch. This caused ModuleNotFoundError during test collection on all Python/PostgreSQL versions in CI. The async and sync variants (test_eager_loading_scenarios_async.py, test_eager_loading_scenarios_sync.py) already exist and work correctly. * fix(test): import Profile from version-specific module, not base models setup_profile_fixtures() imported Profile from the base models module, but User is selected from a version-specific module (e.g. models_py312) via _select_model_class(). The profile relation on the selected User class resolves to the version-specific Profile class, which had no backend configured, causing 'No backend configured' errors in all eager loading tests using with_('profile'). Fix: add Profile to the module-level version-conditional imports using the same _select_model_class() pattern as User, Order, etc. * fix(test): allow TEXT[]/INTEGER[] in column definition and fix detach concurrently assertion - Override format_column_definition in PostgresTableMixin to permit PostgreSQL array types (e.g. TEXT[], INTEGER[]) that contain brackets - Fix test_detach_concurrently_pg14 assertion: PR refactoring moved CONCURRENTLY from adjacent to DETACH to a separate token after the partition name * fix(protocol): declare format_column_definition in PostgresTableSupport The method was added to PostgresTableMixin but not declared in the matching protocol, causing protocol conformance test failure. * feat(partition): complete partitioning support with named expressions, attach improvements, and comprehensive docstrings - Add ATTACH CONCURRENTLY support (PG 14+) to PostgresAttachPartitionExpression - Add ATTACH DEFAULT partition support via partition_values={'default': True} - Refactor format_partition_metadata_query to use dynamic schema filtering - Complete pg_partman create_parent with all 7 optional parameters - Add named expression functions for partition auto-management (create_next_monthly_partition, create_range_partition_for_month, create_range_partition_for_quarter, create_range_partitions_for_interval) via rhosocial-activerecord resolver - Add english docstrings (Args/Returns/Raises) to all partition classes and methods - Add tests: ATTACH CONCURRENTLY, ATTACH DEFAULT, multi-column partition keys, expression boundary values, DETACH FINALIZE, pg_partman optional params, metadata query schema filtering, concurrent_attach capability - Verify on real PostgreSQL 18, 14, 11, 10, 9: all 150+ unit + 27 integration tests pass * chore: add changelog fragment for PR #43 --------- Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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‎.claude/version_control.md‎

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‎.github/PULL_REQUEST_TEMPLATE/bugfix_template.md‎

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If you're unsure about any of these, don't hesitate to ask. We're here to help!
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-->
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- [ ] My code follows the project's [code style guidelines](./.gemini/code_style.md).
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- [ ] My code follows the project's [code style guidelines](./.claude/code_style.md).
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- [ ] I have performed a self-review of my own code.
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- [ ] I have commented my code, particularly in hard-to-understand areas.
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- [ ] I have made corresponding changes to the documentation (Docstrings, `README.md`, etc.).
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- [ ] My changes generate no new warnings.
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- [ ] I have added a [Changelog fragment](./.gemini/version_control.md#5-changelog-management-with-towncrier) (`changelog.d/<issue_number>.<type>.md`).
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- [ ] I have added a [Changelog fragment](./.claude/version_control.md#5-changelog-management-with-towncrier) (`changelog.d/<issue_number>.<type>.md`).
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- [ ] I have verified that my changes do not introduce SQL injection vulnerabilities.
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- [ ] I have checked for potential performance regressions.
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‎.github/PULL_REQUEST_TEMPLATE/feature_template.md‎

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If you're unsure about any of these, don't hesitate to ask. We're here to help!
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- [ ] My code follows the project's [code style guidelines](./.gemini/code_style.md).
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- [ ] My code follows the project's [code style guidelines](./.claude/code_style.md).
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- [ ] I have performed a self-review of my own code.
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- [ ] I have commented my code, particularly in hard-to-understand areas.
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- [ ] I have made corresponding changes to the documentation (Docstrings, `README.md`, etc.).
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- [ ] My changes generate no new warnings.
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- [ ] I have added a [Changelog fragment](./.gemini/version_control.md#5-changelog-management-with-towncrier) (`changelog.d/<issue_number>.<type>.md`).
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- [ ] I have added a [Changelog fragment](./.claude/version_control.md#5-changelog-management-with-towncrier) (`changelog.d/<issue_number>.<type>.md`).
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- [ ] I have verified that my changes do not introduce SQL injection vulnerabilities.
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- [ ] I have checked for potential performance regressions.
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‎.github/PULL_REQUEST_TEMPLATE/release_hotfix_template.md‎

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Go over all the following points, and put an `x` in all the boxes that apply.
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- [ ] My changes follow the project's [version control guidelines](./.gemini/version_control.md) (especially for release and hotfix procedures).
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- [ ] My changes follow the project's [version control guidelines](./.claude/version_control.md) (especially for release and hotfix procedures).
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- [ ] I have updated the `CHANGELOG.md` using `towncrier build` (for releases).
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- [ ] All necessary documentation (e.g., release notes, migration guides) has been prepared or updated.
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- [ ] I have confirmed all CI checks have passed on the target branch after merging (post-merge verification).

‎.github/workflows/test.yml‎

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} >> "$GITHUB_STEP_SUMMARY"
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test-experimental-python-315:
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# Temporarily disabled until Python 3.15 beta/toolchain compatibility stabilizes.
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if: ${{ false }}
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name: Python ${{ matrix.python-version }} / postgres ${{ matrix.postgres-version }} (experimental)
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runs-on: ubuntu-latest
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permissions:

‎changelog.d/43.added.md‎

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Added comprehensive PostgreSQL partitioning support including ATTACH CONCURRENTLY/DEFAULT partition, partition auto-management via named expressions (monthly/quarterly), pg_partman create_parent parameter completion, enhanced partition metadata queries, and full test coverage

‎docs/examples/chapter_02_connection_pool/connection_pool_stress_test_async.py‎

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test_backend = AsyncPostgresBackend(**postgres_config)
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print(f"Backend threadsafety: {test_backend.threadsafety}")
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print(f" 0 = None (not thread-safe)")
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print(f" 1 = driver (only supports SQL)")
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print(f" 2 = Full thread-safe (psycopg)")
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print(f" 0 = None (not thread-safe)") # noqa: F541
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print(f" 1 = driver (only supports SQL)") # noqa: F541
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print(f" 2 = Full thread-safe (psycopg)") # noqa: F541
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print(f"\nPool configuration:") # noqa: F541
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print(f" min_size: {config.min_size}")
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‎docs/examples/chapter_02_connection_pool/connection_pool_stress_test_sync.py‎

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print(f" 0 = None (not thread-safe)") # noqa: F541
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print(f" 1 = driver (only supports SQL)") # noqa: F541
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‎docs/examples/chapter_05_worker_isolation/config.py‎

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import os
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from typing import Optional # noqa: F401
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‎docs/examples/chapter_05_worker_isolation/exp1_shared_connection.py‎

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import multiprocessing # noqa: F401
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from concurrent.futures import ThreadPoolExecutor, ProcessPoolExecutor, as_completed # noqa: F401
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