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---
name: compound-docs
description: Searchable Elixir/Phoenix/Ecto solution documentation system with YAML
frontmatter. Builds institutional knowledge from solved problems. Use when consulting
past solutions before investigating new issues.
---
# Compound Docs — Institutional Knowledge Base
Searchable, categorized solution documentation that makes each
debugging session easier than the last.
## Directory Structure
```
.claude/solutions/
├── ecto-issues/
├── liveview-issues/
├── oban-issues/
├── otp-issues/
├── security-issues/
├── testing-issues/
├── phoenix-issues/
├── deployment-issues/
├── performance-issues/
└── build-issues/
```
## Iron Laws
1. **ALWAYS search solutions before investigating** — Check
`.claude/solutions/` for existing fixes before debugging
2. **YAML frontmatter is MANDATORY** — Every solution needs
validated metadata per `references/schema.md`
3. **One problem per file** — Never combine multiple solutions
4. **Include prevention** — Every solution documents how to
prevent recurrence
## Solution File Format
```markdown
---
module: "Accounts"
date: "2025-12-01"
problem_type: runtime_error
component: ecto_schema
symptoms:
- "Ecto.Association.NotLoaded on user.posts"
root_cause: missing_preload
severity: medium
tags: [preload, association, n-plus-one]
---
# Association NotLoaded on User Posts
## Symptoms
Ecto.Association.NotLoaded raised when accessing user.posts
in UserListLive after filtering.
## Root Cause
Query in Accounts context missing preload for :posts.
## Solution
Added `Repo.preload(:posts)` to `list_users/1`.
## Prevention
Use n1-check skill before shipping list views.
```
## Searching Solutions
Use Grep to search `.claude/solutions/` by symptom (e.g., `NotLoaded`), by tag (e.g., `tags:.*preload`), or by component (e.g., `component: ecto`).
## Integration
- `phx-compound` creates solution docs here
- `phx-investigate` searches here before debugging
- `phx-plan` consults for known risks
- `learn-from-fix` feeds into this system
## References
- `references/schema.md` — YAML frontmatter validation schema
- `references/resolution-template.md` — Full solution template
