# TASK: Phase A — Storage Paths Foundation & Backup Toggle Fix

**Version target:** controller 0.9.0
**Repos:** `deploy-felhom-compose` (controller), `app-catalog-felhom.eu` (compose mount change)

## Overview

Per-app backup toggles (implemented in v0.8.0) don't appear on the backup page. Root cause is two-layered:

1. **`controller.yaml` has no `paths.hdd_path`** → `m.cfg.Paths.HDDPath` is `""` → `ParseComposeHDDMounts` returns nil → `DiscoverAppData` finds zero HDD data → no backup toggles shown
2. **Even with a global hdd_path, the parser uses ONE path** → apps deployed with a different `HDD_PATH` (e.g., `/mnt/hdd_placeholder` vs `/mnt/hdd_1`) won't match

The fix: stop relying on a single global HDD path. Instead, read each app's **own** `HDD_PATH` from its `app.yaml` env section, and introduce a storage paths registry in `settings.json` that auto-discovers paths from deployed apps.

This phase also lays the foundation for multi-storage management (Phase B: UI polish, Phase C: migration wizard).

---

## 1. Root Cause Analysis

### Current broken flow

```
controller.yaml → paths.hdd_path = "" (missing)
                      ↓
backup.Manager.stackProvider.GetStackHDDMounts(name)
  → stacks.ParseComposeHDDMounts(composePath, hddPath="")
    → hddPath == "" → return nil   ← BUG: exits early
                      ↓
DiscoverAppData → info.HasHDDData = false for ALL apps
                      ↓
backups.html → {{if .HasHDDData}} → false → no checkbox rendered
```

### Second layer (would hit even with hdd_path set)

```
controller.yaml → paths.hdd_path = "/mnt/hdd_1"
                      ↓
ParseComposeHDDMounts(composePath, "/mnt/hdd_1")
  → reads compose: "- ${HDD_PATH}/storage/immich:/usr/src/app/upload"
  → resolves ${HDD_PATH} → "/mnt/hdd_1/storage/immich"
  → BUT app.yaml has HDD_PATH="/mnt/hdd_placeholder"
  → actual data is at /mnt/hdd_placeholder/storage/immich
  → os.Stat("/mnt/hdd_1/storage/immich") → not found
  → path.Exists = false, SizeBytes = 0
```

### Correct approach

Read each app's actual `HDD_PATH` from its `app.yaml` env section. The compose template uses `${HDD_PATH}` which gets resolved at `docker compose up` time from the environment. We need to resolve it the same way during discovery.

---

## 2. Storage Paths Registry

### 2.1 New struct in `settings.go`

```go
// StoragePath represents a registered external storage location.
type StoragePath struct {
    Path        string `json:"path"`                   // e.g., "/mnt/hdd_1"
    Label       string `json:"label,omitempty"`         // e.g., "Külső HDD 1TB"
    IsDefault   bool   `json:"is_default,omitempty"`    // new apps use this by default
    Schedulable bool   `json:"schedulable"`             // whether new apps can be deployed here
    AddedAt     string `json:"added_at"`                // RFC3339
}
```

### 2.2 Add to Settings struct

```go
type Settings struct {
    // ... existing fields ...

    // Storage paths registry
    StoragePaths []StoragePath `json:"storage_paths,omitempty"`
}
```

### 2.3 Helper methods on Settings

```go
// GetStoragePaths returns all registered storage paths.
func (s *Settings) GetStoragePaths() []StoragePath

// GetDefaultStoragePath returns the default storage path, or "" if none.
func (s *Settings) GetDefaultStoragePath() string

// GetSchedulableStoragePaths returns paths where new apps can be deployed.
func (s *Settings) GetSchedulableStoragePaths() []StoragePath

// AddStoragePath registers a new storage path after validation.
func (s *Settings) AddStoragePath(path, label string, isDefault bool) error

// RemoveStoragePath removes a path only if no apps reference it.
// Returns error with list of apps using this path if removal is blocked.
func (s *Settings) RemoveStoragePath(path string, appChecker func(string) []string) error

// SetDefaultStoragePath changes which path is the default.
func (s *Settings) SetDefaultStoragePath(path string) error

// SetSchedulable enables/disables a path for new deployments.
func (s *Settings) SetSchedulable(path string, schedulable bool) error
```

### 2.4 Validation rules (in AddStoragePath)

1. **Must be a real mount point** — compare device ID of path vs parent using `syscall.Stat`. Reject paths that are just directories on the boot SSD. Error message: "Ez az útvonal nem külön csatlakoztatott meghajtó. Adatok az SSD-re kerülnének."
2. **Must exist and be a directory** — `os.Stat` check
3. **Must be writable** — attempt to create + remove a temp file
4. **No overlapping paths** — reject if new path is a parent or child of an existing path (e.g., `/mnt/hdd_1` and `/mnt/hdd_1/subdir`)
5. **No duplicates** — reject if path already registered (normalized with `filepath.Clean`)
6. **Must be under `/mnt/`** — soft warning, not hard block (log a WARN for edge cases)

### 2.5 Auto-discovery on startup

On controller startup, if `StoragePaths` is empty in settings.json, auto-discover from deployed apps:

```go
func (s *Settings) AutoDiscoverStoragePaths(stacksDir string, fallbackHDDPath string, logger *log.Logger) {
    if len(s.StoragePaths) > 0 {
        return // already configured, don't override
    }

    // Scan all deployed apps' app.yaml for HDD_PATH values
    seen := map[string]bool{}
    entries, _ := os.ReadDir(stacksDir)
    for _, e := range entries {
        if !e.IsDir() { continue }
        appCfg := LoadAppConfig(filepath.Join(stacksDir, e.Name()))
        if appCfg == nil || !appCfg.Deployed { continue }
        if hddPath, ok := appCfg.Env["HDD_PATH"]; ok && hddPath != "" {
            cleaned := filepath.Clean(hddPath)
            if !seen[cleaned] {
                seen[cleaned] = true
            }
        }
    }

    // Also use controller.yaml paths.hdd_path as fallback seed
    if fallbackHDDPath != "" {
        cleaned := filepath.Clean(fallbackHDDPath)
        if !seen[cleaned] {
            seen[cleaned] = true
        }
    }

    // Register discovered paths
    isFirst := true
    for path := range seen {
        sp := StoragePath{
            Path:        path,
            Label:       inferStorageLabel(path),
            IsDefault:   isFirst,
            Schedulable: true,
            AddedAt:     time.Now().UTC().Format(time.RFC3339),
        }
        s.StoragePaths = append(s.StoragePaths, sp)
        isFirst = false
    }

    if len(s.StoragePaths) > 0 {
        s.Save()
        logger.Printf("[INFO] Auto-discovered %d storage path(s)", len(s.StoragePaths))
        for _, sp := range s.StoragePaths {
            logger.Printf("[INFO]   %s (%s) default=%v", sp.Path, sp.Label, sp.IsDefault)
        }
    }
}
```

Helper `inferStorageLabel(path)`:
- `/mnt/hdd_1` → "Külső tárhely (hdd_1)"
- `/mnt/hdd_placeholder` → "Külső tárhely (hdd_placeholder)"
- Anything else → path basename

Note: `LoadAppConfig` is in the `stacks` package. To avoid circular imports, either pass a scanner function or do the scanning in `main.go` and pass the discovered paths in. Use whichever approach avoids import issues.

---

## 3. Fix `GetStackHDDMounts` — Per-App HDD_PATH Resolution

### 3.1 Change the adapter

Currently:
```go
func (a *stackAdapter) GetStackHDDMounts(name string) []string {
    s, ok := a.mgr.GetStack(name)
    if !ok { return nil }
    return stacks.ParseComposeHDDMounts(s.ComposePath, a.hddPath)  // ← uses global path
}
```

Change to:
```go
func (a *stackAdapter) GetStackHDDMounts(name string) []string {
    s, ok := a.mgr.GetStack(name)
    if !ok { return nil }

    // Priority 1: Read the app's own HDD_PATH from its app.yaml
    stackDir := filepath.Dir(s.ComposePath)
    appCfg := stacks.LoadAppConfig(stackDir)
    if appCfg != nil && appCfg.Env["HDD_PATH"] != "" {
        return stacks.ParseComposeHDDMounts(s.ComposePath, appCfg.Env["HDD_PATH"])
    }

    // Priority 2: Try all registered storage paths (fallback)
    var allMounts []string
    seen := map[string]bool{}
    for _, sp := range a.getStoragePaths() {
        mounts := stacks.ParseComposeHDDMounts(s.ComposePath, sp.Path)
        for _, m := range mounts {
            if !seen[m] {
                seen[m] = true
                allMounts = append(allMounts, m)
            }
        }
    }
    return allMounts
}
```

### 3.2 Update adapter struct

```go
type stackAdapter struct {
    mgr             *stacks.Manager
    getStoragePaths func() []settings.StoragePath  // getter from settings
}
```

Wire in `main.go`:
```go
adapter := &stackAdapter{
    mgr:             stackMgr,
    getStoragePaths: func() []settings.StoragePath { return settingsMgr.GetStoragePaths() },
}
```

Remove the old `hddPath string` field from the adapter.

### 3.3 `resolveAppBackupPaths()` in backup Manager

No changes needed — it already calls `m.stackProvider.GetStackHDDMounts(stackName)` which we're fixing above. The fix propagates automatically.

---

## 4. Controller Docker Compose Mount Change

### 4.1 Change in `controller/docker-compose.yml`

Replace:
```yaml
      - ${HDD_PATH:-/mnt/hdd_placeholder}:${HDD_PATH:-/mnt/hdd_placeholder}:ro
```

With:
```yaml
      # All external storage — covers /mnt/* paths for multi-storage support + restore
      - /mnt:/mnt:rw
```

**Why `:rw`:** Required for restore feature (already implemented). Also needed for mount-point validation (write test in AddStoragePath).

**Why `/mnt:/mnt`:** All standard storage mounts are under `/mnt`. Covers current and future drives with one entry. No controller restart when adding new drives.

### 4.2 Also update `docker-setup.sh`

If `docker-setup.sh` generates the controller compose, update it to emit `/mnt:/mnt:rw` instead of the old `${HDD_PATH}` line.

---

## 5. Deploy Page: Storage Path Dropdown

### 5.1 When app has a `path` type deploy field (HDD_PATH)

Currently renders as a plain text input. Change to dropdown when storage paths exist:

```html
{{if eq .Type "path"}}
    {{if $.StoragePaths}}
    <select id="field-{{.EnvVar}}" name="{{.EnvVar}}" class="form-control"
            {{if $.AlreadyDeployed}}disabled{{end}}>
        {{range $.StoragePaths}}
        <option value="{{.Path}}" {{if .IsDefault}}selected{{end}}>
            {{.Label}} ({{.Path}}) {{if .IsDefault}}— alapértelmezett{{end}}
        </option>
        {{end}}
    </select>
    {{else}}
    <input type="text" id="field-{{.EnvVar}}" name="{{.EnvVar}}"
           class="form-control" value="{{.Default}}"
           placeholder="{{.Placeholder}}"
           {{if .Required}}required{{end}}
           {{if $.AlreadyDeployed}}disabled{{end}}>
    <span class="form-hint form-hint-warn">
        Nincs regisztrált adattároló. Adjon hozzá egyet a Beállítások oldalon.
    </span>
    {{end}}
{{end}}
```

### 5.2 Pass storage paths to deploy page template data

In the deploy handler:
```go
data["StoragePaths"] = settingsMgr.GetSchedulableStoragePaths()
```

### 5.3 Already-deployed: show current path read-only

When `AlreadyDeployed == true`, the field is disabled. Show the actual `HDD_PATH` from `app.yaml` as the displayed value (existing behavior works as-is with a disabled select or text input).

### 5.4 Edge case: no schedulable paths but app needs HDD

If `resources.needs_hdd: true` and zero schedulable paths:
- Show warning: "Nincs elérhető adattároló. Csatlakoztasson külső meghajtót és adja hozzá a Beállítások oldalon."
- Disable deploy button (add `data-needs-storage="true"` to form, JS disables submit)

---

## 6. Storage Path Monitoring Integration

### 6.1 Periodic mount-point check

Add to existing system health check (runs every `system_health_interval`, default 5m):

```go
func checkStoragePaths(paths []settings.StoragePath, logger *log.Logger) []string {
    var warnings []string
    for _, sp := range paths {
        // Check 1: path exists and is directory
        fi, err := os.Stat(sp.Path)
        if err != nil {
            warnings = append(warnings, fmt.Sprintf("Adattároló nem elérhető: %s", sp.Path))
            continue
        }
        if !fi.IsDir() {
            warnings = append(warnings, fmt.Sprintf("Adattároló nem mappa: %s", sp.Path))
            continue
        }

        // Check 2: still a real mount point (not writing to SSD)
        if !isMountPoint(sp.Path) {
            warnings = append(warnings,
                fmt.Sprintf("FIGYELEM: %s nincs felcsatolva (leválasztva?) — "+
                    "az adatok az SSD-re íródnának!", sp.Path))
        }

        // Check 3: disk space (reuse existing threshold config)
        usage := getDiskUsage(sp.Path)
        if usage.UsedPercent >= 90 {
            warnings = append(warnings,
                fmt.Sprintf("Adattároló majdnem tele: %s (%.0f%%)", sp.Path, usage.UsedPercent))
        }
    }
    return warnings
}
```

### 6.2 `isMountPoint()` implementation

New file: `controller/internal/system/mounts.go`

```go
// IsMountPoint checks if a path is a mount point by comparing device IDs.
// Returns true if path is on a different device than its parent.
func IsMountPoint(path string) bool {
    var pathStat, parentStat syscall.Stat_t
    if err := syscall.Stat(path, &pathStat); err != nil {
        return false
    }
    parent := filepath.Dir(path)
    if err := syscall.Stat(parent, &parentStat); err != nil {
        return false
    }
    return pathStat.Dev != parentStat.Dev
}
```

Platform-specific: needs build tag `//go:build linux` (consistent with existing system package). Add stub for non-Linux that always returns true.

### 6.3 Surface warnings

- Add storage warnings to monitoring page warnings section (existing infrastructure)
- Include in hub report `SystemWarnings` field (already exists)
- Fire `disk_warning` notification event for enabled customers

---

## 7. Beállítások Page: Storage Section

Add between "Rendszer konfiguráció" and "Jelszó módosítás" sections.

### 7.1 Template: "Adattárolók" section

```html
<!-- Section: Storage Paths -->
<div class="settings-card">
    <h3>Adattárolók</h3>
    <p class="settings-card-desc">
        Külső meghajtók, ahol az alkalmazások felhasználói adatai tárolódnak.
    </p>

    {{if .StorageError}}<div class="alert alert-error">{{.StorageError}}</div>{{end}}
    {{if .StorageSuccess}}<div class="alert alert-info">{{.StorageSuccess}}</div>{{end}}

    {{if .StoragePaths}}
    <div class="storage-paths-list">
        {{range .StoragePaths}}
        <div class="storage-path-item {{if not .Schedulable}}storage-path-disabled{{end}}">
            <div class="storage-path-header">
                <div class="storage-path-info">
                    <span class="storage-path-label">{{.Label}}</span>
                    <span class="storage-path-path mono">{{.Path}}</span>
                </div>
                <div class="storage-path-badges">
                    {{if .IsDefault}}<span class="meta-badge meta-badge-ok">alapértelmezett</span>{{end}}
                    {{if not .Schedulable}}<span class="meta-badge meta-badge-warn">nem ütemezhet</span>{{end}}
                    {{if .DiskInfo}}
                    <span class="mono storage-path-usage">
                        {{.DiskInfo.UsedHuman}} / {{.DiskInfo.TotalHuman}} ({{.DiskInfo.UsedPercent}}%)
                    </span>
                    {{end}}
                </div>
            </div>
            {{if .AppCount}}
            <div class="storage-path-apps">
                {{.AppCount}} alkalmazás használja
            </div>
            {{end}}
            <div class="storage-path-actions">
                {{if not .IsDefault}}
                <form method="POST" action="/settings/storage/default" style="display:inline">
                    <input type="hidden" name="storage_path" value="{{.Path}}">
                    <button type="submit" class="btn btn-xs btn-outline">Alapértelmezetté tétel</button>
                </form>
                {{end}}
                <form method="POST" action="/settings/storage/schedulable" style="display:inline">
                    <input type="hidden" name="storage_path" value="{{.Path}}">
                    <input type="hidden" name="schedulable" value="{{if .Schedulable}}false{{else}}true{{end}}">
                    <button type="submit" class="btn btn-xs btn-outline">
                        {{if .Schedulable}}Letiltás{{else}}Engedélyezés{{end}}
                    </button>
                </form>
                {{if and (not .IsDefault) (eq .AppCount 0)}}
                <form method="POST" action="/settings/storage/remove" style="display:inline"
                      onsubmit="return confirm('Biztosan törli a(z) {{.Path}} adattárolót?')">
                    <input type="hidden" name="storage_path" value="{{.Path}}">
                    <button type="submit" class="btn btn-xs btn-danger-outline">Törlés</button>
                </form>
                {{end}}
            </div>
        </div>
        {{end}}
    </div>
    {{else}}
    <div class="alert alert-info">
        Nincs regisztrált adattároló. Csatlakoztasson külső meghajtót és adja hozzá alább.
    </div>
    {{end}}

    <!-- Add new path -->
    <details class="storage-add-section">
        <summary class="btn btn-sm btn-outline" style="margin-top:1rem">+ Új adattároló hozzáadása</summary>
        <form method="POST" action="/settings/storage/add" class="storage-add-form">
            <div class="form-group">
                <label for="storage_path">Útvonal</label>
                <input type="text" id="storage_path" name="storage_path"
                       class="form-control" placeholder="/mnt/hdd_1" required>
                <span class="form-hint">A felcsatolt meghajtó elérési útja (pl. /mnt/hdd_1)</span>
            </div>
            <div class="form-group">
                <label for="storage_label">Megnevezés (opcionális)</label>
                <input type="text" id="storage_label" name="storage_label"
                       class="form-control" placeholder="Külső HDD 1TB">
            </div>
            <div class="form-group">
                <label class="toggle">
                    <input type="checkbox" name="storage_default" value="true">
                    <span class="toggle-label">Beállítás alapértelmezettként</span>
                </label>
            </div>
            <button type="submit" class="btn btn-primary">Hozzáadás</button>
        </form>
    </details>
</div>
```

### 7.2 Routes

| Method | Path | Auth? | Handler |
|--------|------|-------|---------|
| POST | `/settings/storage/add` | Yes | Add storage path with validation |
| POST | `/settings/storage/remove` | Yes | Remove (blocked if apps use it) |
| POST | `/settings/storage/default` | Yes | Set default storage path |
| POST | `/settings/storage/schedulable` | Yes | Toggle schedulable on/off |

### 7.3 Handler: `/settings/storage/add`

1. Parse form: `storage_path`, `storage_label`, `storage_default`
2. Clean path with `filepath.Clean`
3. Validate (Section 2.4):
   - Exists + is directory → error: "Az útvonal nem létezik vagy nem mappa."
   - Is mount point → error: "Ez az útvonal nem külön csatlakoztatott meghajtó. Adatok az SSD-re kerülnének!"
   - Writable → error: "Az útvonal nem írható."
   - No overlap → error: "Az útvonal átfedi a már regisztrált XYZ útvonalat."
   - No duplicate → error: "Ez az útvonal már regisztrálva van."
4. If `storage_default`, unset previous default
5. Add to settings.json via `AddStoragePath()`
6. Redirect to `/settings` with flash: "Adattároló sikeresen hozzáadva: /mnt/hdd_1"
7. On error: redirect with error flash

### 7.4 Handler: `/settings/storage/remove`

1. Parse form: `storage_path`
2. Count apps using this path (scan app.yaml files for `HDD_PATH`)
3. If apps found → error: "Nem törölhető: az alábbi alkalmazások használják: Immich, Paperless-ngx"
4. Cannot be the default path → error: "Az alapértelmezett adattároló nem törölhető."
5. If only one path left → error: "Az utolsó adattároló nem törölhető."
6. Remove from settings.json
7. Redirect with success flash

### 7.5 Template data for settings page

Add to the settings handler:
```go
type StoragePathView struct {
    settings.StoragePath
    DiskInfo *DiskUsageInfo  // total, used, percent
    AppCount int             // number of deployed apps with HDD_PATH matching this
    IsMounted bool           // mount-point check result
}
```

Populate by scanning `app.yaml` files for `HDD_PATH` and matching against registered paths.

---

## 8. Deprecate `paths.hdd_path` from controller.yaml

### 8.1 Backward compatibility

Keep reading `paths.hdd_path` — use it only as fallback seed for auto-discovery on first run.

Startup order in `main.go`:
```go
// 1. Load settings.json
settingsMgr, _ := settings.Load(...)

// 2. Auto-discover storage paths (if settings.json has none)
settingsMgr.AutoDiscoverStoragePaths(cfg.Paths.StacksDir, cfg.Paths.HDDPath, logger)

// 3. Wire adapter with storage paths getter
adapter := &stackAdapter{
    mgr:             stackMgr,
    getStoragePaths: func() []settings.StoragePath { return settingsMgr.GetStoragePaths() },
}
```

### 8.2 Update configs/controller.yaml.example

```yaml
paths:
  stacks_dir: "/opt/docker/stacks"
  # hdd_path is DEPRECATED — storage paths are managed via web UI (Beállítások > Adattárolók)
  # Existing value is auto-migrated to settings.json on first startup
  # hdd_path: "/mnt/hdd_1"
```

---

## 9. Implementation Steps

### Step 1: Storage paths in settings.json
- Add `StoragePath` struct and `StoragePaths` field to `Settings`
- Add all getter/setter methods
- Add `AutoDiscoverStoragePaths()` — note: may need to pass a scanner function or do scanning in main.go to avoid circular import with stacks package
- Add `inferStorageLabel()` helper
- **Test:** Manually create a `settings.json` with `storage_paths` → Load → verify GetStoragePaths returns them

### Step 2: Mount-point validation utilities
- Create `controller/internal/system/mounts.go` with `IsMountPoint()` (Linux + stub)
- Add overlap check helper: `PathsOverlap(a, b string) bool`
- Add writable check helper: `IsWritable(path string) bool`
- **Test:** `IsMountPoint("/mnt/hdd_1")` → true, `IsMountPoint("/tmp")` → false

### Step 3: Wire auto-discovery on startup
- In `main.go`: call `AutoDiscoverStoragePaths` after loading settings
- Pass `cfg.Paths.HDDPath` as fallback
- **Test:** Start controller on demo-felhom with empty settings.json → should auto-discover `/mnt/hdd_placeholder` from deployed apps' app.yaml

### Step 4: Fix per-app HDD_PATH resolution (THE CORE FIX)
- Update `stackAdapter` struct: replace `hddPath string` with `getStoragePaths func()`
- Update `GetStackHDDMounts()` to read per-app HDD_PATH from app.yaml first, fallback to registered paths
- Wire updated adapter in `main.go`
- **Test:** Backup page → "Alkalmazás adatok" section now shows with correct paths (e.g., `/mnt/hdd_placeholder/storage/immich`). Backup toggles are visible and functional.

### Step 5: Controller compose mount change
- Change `controller/docker-compose.yml`: `/mnt:/mnt:rw`
- Update `docker-setup.sh` controller compose generation
- **Test:** Recreate controller container → verify both `/mnt/hdd_1` and `/mnt/hdd_placeholder` accessible inside container

### Step 6: Beállítások storage section
- Add "Adattárolók" section to `settings.html`
- Add handlers: `POST /settings/storage/add`, `/remove`, `/default`, `/schedulable`
- Add `StoragePathView` type for template data with disk info + app count
- Pass storage data to settings page handler
- Add CSS for storage path items
- **Test:** Add path via UI → validation catches non-mount-point. Remove path with apps → blocked with app list. Set default → badge updates.

### Step 7: Deploy page dropdown
- Modify `deploy.html`: path field becomes dropdown when storage paths exist
- Pass `StoragePaths` to deploy page template data
- Fall back to text input if no paths registered
- Block deploy if app needs HDD but no schedulable paths
- **Test:** Deploy page for Immich → dropdown shows registered paths. Already-deployed shows current path read-only.

### Step 8: Storage monitoring integration
- Add `checkStoragePaths()` to system health check
- Surface warnings on monitoring page
- Include in hub report
- Fire `disk_warning` notification for unmounted drives
- **Test:** (Simulated) If path doesn't exist → warning appears on monitoring page within one health check cycle

### Step 9: Cleanup & version bump
- Deprecate `paths.hdd_path` in controller.yaml.example
- Create new CHANGELOG.md, changelogs will be updated there, not in CONTEXT.md. CONTEXT.md will only have information about architecture decisions, roadmap, information about the project
- Regenerate CONTEXT.md with current architecture, deparating different sections, with detailed descriptions how it should work, what is planned, what is the architecture. Sections like: Storage management, Notifications, Backup management, App management, Monitoring, Infra, Settings management, etc-etc..
- Update CONTEXT.md / CHANGELOG.md / CLAUDE.md
- Bump to 0.9.0
- Build + deploy
- **Test end-to-end:** Auto-discover → backup toggles visible → enable Immich backup → manual backup → verify HDD data in restic snapshot → storage management in Beállítások works

---

## 10. Files to Create / Modify

### New files:
- `controller/internal/system/mounts.go` — `IsMountPoint()`, `IsWritable()`, `PathsOverlap()` + non-Linux stub
- (No new packages — StoragePath goes in existing `settings` package)

### Modified files:
- `controller/internal/settings/settings.go` — `StoragePath` struct, `StoragePaths` field, all getter/setter methods, `AutoDiscoverStoragePaths()`, `inferStorageLabel()`, validation logic
- `controller/cmd/controller/main.go` — Wire auto-discovery, update stackAdapter struct (replace `hddPath` with `getStoragePaths`), update adapter constructor
- `controller/internal/web/handlers.go` — Storage management handlers (`/settings/storage/*`), pass StoragePaths to deploy + settings templates
- `controller/internal/web/server.go` — Register new storage routes
- `controller/internal/web/templates/settings.html` — New "Adattárolók" section
- `controller/internal/web/templates/deploy.html` — Path field → dropdown, edge case warnings
- `controller/internal/web/templates/style.css` — Storage path item styles, badges
- `controller/internal/monitoring/health.go` (or wherever health checks live) — Add `checkStoragePaths()`
- `controller/docker-compose.yml` — `/mnt:/mnt:rw`
- `controller/configs/controller.yaml.example` — Deprecation comment
- `docker-setup.sh` — Update controller compose generation

---

## 11. Design Decisions & Notes

### Why settings.json, not controller.yaml?
controller.yaml is operator-controlled (read-only from customer perspective). User-configurable state lives in settings.json. Clear separation: operator configures infrastructure, customer configures preferences.

### Why auto-discover from app.yaml?
Existing deployments already have apps with HDD_PATH set. Auto-discovery makes the upgrade seamless — backup toggles appear without manual intervention after the update.

### Why `/mnt:/mnt:rw` instead of individual mounts?
Single mount covers all current and future storage devices. No controller restart when adding new drives. Required for restore + validation. Trade-off: broader access, but controller already has Docker socket access and is a trusted component.

### Why validate mount points?
If a USB drive is disconnected but the empty directory remains (created by Docker or `nofail` fstab), data silently writes to the SSD boot drive. Mount-point check (device ID comparison) catches this. This is the #1 gotcha for home server setups.

### Why no overlapping paths?
If `/mnt/hdd_1` and `/mnt/hdd_1/storage` are both registered, discovery counts files twice and backup may include data twice. One entry per physical mount point keeps it simple.

### Why fallback chain in GetStackHDDMounts?
1. App's own HDD_PATH from app.yaml (most accurate — the actual deployed value)
2. Try all registered storage paths (handles edge cases: missing app.yaml, new template before deploy)
Ensures backup discovery works even in degraded states.

### Why `Schedulable` toggle?
An "unschedulable" path means existing apps stay put but no new apps can use it. Useful for drives that are filling up or being deprecated — prevents new deployments while allowing existing apps to continue operating.

### Future phases (NOT in scope)
- **Phase B:** Storage management UI polish — disk usage bars per path, per-app storage column on apps page
- **Phase C:** Migration wizard — "Mozgatás" button per app, rsync with progress reporting, automatic app.yaml HDD_PATH update + restart, old data cleanup option