[#181] add sync-data-relational skills

.claude/skills/sync-data-relational/SKILL.md

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+---
+name: sync-data-relational
+description: Analyze spring-data-relational version changes and identify required updates for the current project. Use when upgrading spring-data-relational versions or syncing with upstream changes.
+allowed-tools: [WebFetch, Grep, Read, Glob, Bash, TodoWrite]
+---
+
+# Sync Spring Data Relational Changes
+
+This skill helps synchronize spring-data-relational version updates to the spring-jdbc-plus project.
+
+## When to Use
+
+- When a new spring-data-relational version is released
+- When asked to "sync data-relational changes"
+- When asked to "update to spring-data-relational X.X.X"
+- When analyzing what needs to be updated for a version upgrade
+
+## What This Skill Does
+
+1. **Fetches Version Diff**: Retrieves changes between two spring-data-relational versions from GitHub
+2. **Analyzes Changes**: Categorizes changes into:
+   - API changes (new methods, deprecated methods, signature changes)
+   - Dependency upgrades
+   - Bug fixes
+   - Documentation updates
+3. **Identifies Impact**: Searches the current codebase for affected code
+4. **Provides Action Items**: Lists specific files and changes needed
+
+## Instructions
+
+### Step 1: Determine Versions
+
+1. Check `gradle.properties` to find current `springDataBomVersion`
+2. Determine the spring-data-relational version from the BOM version
+   - Spring Data BOM 2025.0.5 → spring-data-relational 3.5.5
+   - Spring Data BOM 2025.0.6 → spring-data-relational 3.5.6
+3. Ask user for target version if not specified
+
+### Step 2: Fetch Changes from GitHub
+
+Use WebFetch to get the comparison from:
+`https://github.com/spring-projects/spring-data-relational/compare/{old-version}...{new-version}`
+
+Example: `https://github.com/spring-projects/spring-data-relational/compare/3.5.5...3.5.6`
+
+### Step 3: Analyze Changes
+
+Categorize the changes:
+
+**Critical Changes** (High Priority):
+- API deprecations
+- Breaking changes
+- Signature changes in methods we override/use
+
+**Important Changes** (Medium Priority):
+- New features we might want to adopt
+- Bug fixes that affect our code
+- Dependency upgrades
+
+**Informational** (Low Priority):
+- Documentation updates
+- Internal refactoring
+- Minor bug fixes
+
+### Step 4: Search Current Codebase
+
+For each critical/important change, search the codebase:
+
+1. Use Grep to find usages of:
+   - Deprecated classes/methods
+   - Changed API signatures
+   - Affected dependencies
+
+2. Focus on these directories:
+   - `spring-data-jdbc-plus-support/`
+   - `spring-data-jdbc-plus-sql/`
+   - `spring-data-jdbc-plus-repository/`
+   - `spring-boot-autoconfigure-data-jdbc-plus/`
+
+### Step 5: Generate Report
+
+Create a structured report with:
+
+```markdown
+## Spring Data Relational {old} → {new} Upgrade Analysis
+
+### Summary
+- Total commits: X
+- Files changed: Y
+- Critical changes: Z
+
+### Critical Changes Requiring Action
+
+#### 1. [Change Category - e.g., API Deprecation]
+**Upstream Change**: Description of what changed in spring-data-relational
+**Impact**: Files in our codebase that are affected
+**Action Required**: What needs to be done
+
+[List specific files with line numbers if found]
+
+### Important Changes to Review
+
+[Same format as above]
+
+### Dependency Updates
+
+[List dependency version changes]
+
+### Low Priority / Informational
+
+[Brief list of other changes]
+
+### Next Steps
+
+1. [ ] Review critical changes
+2. [ ] Update affected code
+3. [ ] Update gradle.properties if needed
+4. [ ] Run tests
+5. [ ] Update documentation
+```
+
+### Step 6: Provide Actionable Next Steps
+
+- Create TODO items for each required change
+- Suggest specific code modifications
+- Highlight test cases that should be added/updated
+
+## Examples
+
+**User**: "Sync data-relational changes from 3.5.5 to 3.5.6"
+**Skill**:
+1. Fetches https://github.com/spring-projects/spring-data-relational/compare/3.5.5...3.5.6
+2. Identifies: API deprecations, dependency upgrades
+3. Searches codebase for affected code
+4. Generates report with action items
+
+**User**: "What needs to be updated for spring-data-relational 3.5.6?"
+**Skill**:
+1. Checks current version in gradle.properties
+2. Compares with 3.5.6
+3. Provides analysis and action items
+
+## Important Notes
+
+- Always use TodoWrite to track the analysis tasks
+- Focus on changes that affect the core modules (support, sql, repository)
+- Consider backward compatibility when suggesting changes
+- Highlight security-related changes with high priority
+- Note any changes to transitive dependencies that might affect our users
+
+## Related Files
+
+- `gradle.properties` - Contains springDataBomVersion
+- `buildSrc/src/main/groovy/spring.jdbc.plus.spring-bom-conventions.gradle` - BOM configuration
+- `spring-data-jdbc-plus-support/` - Core support module
+- `spring-data-jdbc-plus-sql/` - SQL module
+- `spring-data-jdbc-plus-repository/` - Repository module