February 2026: Delivered targeted docs improvements in jpug-doc to clarify SQL behavior under concurrency and query planning, aligning with the 18.1 release. The work enhances user understanding, reduces support load, and supports smoother adoption of new features.

January 2026 monthly summary for repository pgsql-jp/jpug-doc focused on documentation quality improvements driven by feedback and clarity enhancements.

2025-12: Delivered focused PostgreSQL JP documentation updates in jpug-doc for PostgreSQL 18.0, covering installation prerequisites, GIN index parameters, and COPY command behavior. Standardized terminology (ユーザー -> ユーザ) across the JP docs. This work improves JP market readiness, developer onboarding, and reduces support queries by providing clear, consistent guidance aligned with the 18.0 release.

During 2025-11 for repo pgsql-jp/jpug-doc, key features delivered include 18.0 maintenance and feature improvements covering updates to maintenance, charset, datetime, *_foreign_table, dml, pg_verifybackup, create_index, rules, and other 18.0 refinements; plus PostgreSQL 18.0 compatibility updates for components pg_combinebackupt, merge, pg_resetwal, and copy. Major bugs fixed: Responded to and closed code-review feedback from Tanaka-san and Copilot, removed an unnecessary sentence, and completed batch-2 review resolutions. Overall impact: Enhanced 18.0 release readiness, stability, and maintainability; improved upgrade risk profile and cross-component consistency. Technologies/skills demonstrated: Git-based collaboration, detailed change traceability via commit messages, cross-repo maintenance, PostgreSQL 18.0 feature integration, and strong communication with reviewers.

October 2025 (2025-10) monthly summary for repository pgsql-jp/jpug-doc. Focused on PostgreSQL 18.0 readiness across docs and related tooling, delivering extensive 18.0 updates across core components and ancillary modules, plus quality improvements and targeted bug fixes. Key areas updated include reindex, pgbench, pg_basebackup, and tablespace mappings, as well as Core 18.0 Updates in Parts 1–5, PL/Tcl, Manage-AG, History, Trigger, and extension support. Changes were implemented through a coherent set of commits that align documentation with the 18.0 feature set and upgrade paths.

Month 2025-09: Document-focused contributions in the pgsql-jp/jpug-doc repository, delivering clarity and localization improvements for PostgreSQL 17.6 documentation. Work concentrated on two major updates to help admins and Japanese users operate safely and efficiently, with no reported critical bugs fixed this month.

Delivered focused enhancements to the jpug-doc repository to improve documentation quality and upgrade readiness for PostgreSQL 17.6. Improvements span translation and terminology consistency across English and Japanese docs, addition of Version 17.6 maintenance/upgrade notes (including multi-transaction ID handling and upgrade-time restrictions), and clarifications on the REFERENCING clause usage for AFTER/UPDATE triggers to prevent misinterpretation of transition relations. These changes align with release goals and reduce user confusion during upgrade and daily usage.

June 2025 monthly summary for developer documentation work across two repos (pgsql-jp/jpug-doc and organicmaps/website). Delivered comprehensive PostgreSQL 17.5 documentation updates for core tooling, event triggers, DDL behavior, and replication/subscriptions, plus extensive quality and localization improvements. Also updated Japanese translations and metadata for the Organic Maps website to ensure content accuracy and consistency with release notes. Focused on business value by aligning docs with the 17.5 release, reducing onboarding and support friction, and improving Japanese localization for end users.

May 2025: Delivered comprehensive PostgreSQL 17.5 documentation translation and clarity improvements in the jpug-doc repo, focusing on translation accuracy, terminology consistency, and clarified guidance across core topics. Completed 12 commits that fixed overtranslation, corrected source/target terminology, and updated 17.5-specific notes for domain, index, database utilities, PL/Perl security, history, materialized views, WAL dumps, JSON sorting, autovacuum explanations, ATTACH PARTITION, and IPC/huge pages runtime parameters. Achieved reviewer feedback integration (notably Ishii-san), improving readability and guidance. Business impact: clearer documentation for Japanese readers accelerates 17.5 adoption and reduces support queries; technical impact: improved localization workflow and documentation quality across modules.

April 2025 performance summary focusing on documentation quality and localization across two repositories. Key features delivered include MERGE command documentation improvements for v17.0 in jpug-doc (clarified WHEN clauses and RETURNING behavior, corrected a typo, and specified which relations can be referenced and system attributes of the target), PL/pgSQL cursor behavior documentation (noting that cursors created inside a loop become holdable after the first COMMIT/ROLLBACK), and Japanese translations improvements (clarify CREATE FUNCTION parallel safety labeling and fix translation typos). In Organic Maps, localization updates delivered Japanese translations for the website (translated English strings into Japanese and updated PO metadata). Major bugs fixed include typo corrections in MERGE doc and translation typos addressed in JPUG docs and website translations. Overall impact: improved accuracy, consistency, and usability of documentation and localization, reducing ambiguity for users and support teams, accelerating onboarding for Japanese-speaking users, and strengthening cross-repo documentation standards. Technologies/skills demonstrated: documentation authoring for PostgreSQL features, localization/translation workflows, version-control collaboration, cross-repo coordination, and a solid understanding of MERGE, WHEN clauses, RETURNING semantics, and PL/pgSQL cursor behavior.

March 2025: jpug-doc delivered comprehensive PostgreSQL 17.0 documentation updates across modules (EXPLAIN, ltree, pgbench, COPY, initdb, plpgsql, operators, triggers, color environment variable, create function, protocol notes); applied corrections, clarifications, and language refinements to improve accuracy and readability for Japanese users. Completed a multi-round review cycle with Saito-san and Tanaka-san, addressing reviewer feedback across multiple commits to align with the 17.0 release.

February 2025: Key PostgreSQL 17.0 readiness work in jpug-doc and Japanese localization fixes in Organic Maps. Features delivered across jpug-doc included updates to indexing (create_index), unaccent, user-management, cluster, DML, create_function, FDW handler, miscellaneous 17.0 updates, and cross-module compatibility (ltree, pg_receivewal, file-fdw, create_view, and rule) to align with the 17.0 upgrade path. This involved a coordinated set of commits and code-review iterations to ensure robust upgrades. Major bug fixes include Japanese localization corrections for login and sorting in Organic Maps, improving UI clarity and consistency. Impact: reduced upgrade risk, smoother migration to PostgreSQL 17.0, and improved Japanese UI experience. Technologies/skills demonstrated: PostgreSQL extension/module updates, cross-repo coordination, code-review resolution, and i18n localization workflows.

January 2025 monthly summary for organicmaps/organicmaps focused on localization quality improvements and user-facing accuracy. Key bug fixed: Japanese translation for the track recording label corrected to 'トラックを記録する', aligning with user expectations and Japanese usage. Associated commit: 9ff69ede4f6d0730c78a8a552be6f28d1db1816f. Impact: clearer UI for Japanese users, reduced confusion, and strengthened i18n standards. Technologies/skills demonstrated: localization (i18n), translation management, QA validation, commit hygiene.

December 2024: PostgreSQL 17.0 Documentation Enhancements delivered for the jpug-doc repo, aligning release notes and usage guidance with the new 17.0 features. The work focused on clarifying syntax and behavior for table and constraint operations, including generated columns, statistics targets, adding constraints with existing indexes, and table access methods; and expanded storage documentation with enhanced error reporting coverage, severity levels, error codes, and file naming for temporary relations, plus clarifications on row version deletion during updates and VACUUM.

November 2024-11 monthly summary for pgsql-jp/jpug-doc: Delivered comprehensive PostgreSQL 17.0 documentation updates across multiple components, ensuring accurate reflection of 17.0 features and behaviors. Updated documentation areas span SPI, runtime parameters, dfunc, generic WAL records, intagg, maintenance, MXID wraparound warnings, pg_checksums, SELECT WITH clause and MERGE, ALTER SYSTEM, CREATE COLLATION, CREATE DOMAIN, psql, VACUUM, DELETE, limits, pg_amcheck, ANALYZE, and related tooling. Work included coordinating reviewer feedback, cross-module consistency checks, and finalizing 17.0 docs across 20+ files.