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+# Metadata Field Mappings
+
+Maps each canonical field to the dot-path where its value lives inside `sourcedMetadata.<source>`.
+
+Used by `SOURCE_FIELD_PATHS` in `utils/metadata.resolution.utils.ts` and drives both the auto-resolution algorithm and the cherry-pick comparison view.
+
+Dot-notation paths are relative to `sourcedMetadata.<source>`
+(e.g. `volumeInformation.name` → `comic.sourcedMetadata.comicvine.volumeInformation.name`).
+
+---
+
+## Source API Notes
+
+| Source | API | Auth | Notes |
+|---|---|---|---|
+| ComicVine | `https://comicvine.gamespot.com/api/` | Free API key | Covers Marvel, DC, and independents |
+| Metron | `https://metron.cloud/api/` | Free account | Modern community DB, growing |
+| GCD | `https://www.comics.org/api/` | None | Creators/characters live inside `story_set[]`, not top-level |
+| LOCG | `https://leagueofcomicgeeks.com` | No public API | Scraped or partner access |
+| ComicInfo.xml | Embedded in archive | N/A | ComicRack standard |
+| Shortboxed | `https://api.shortboxed.com` | Partner key | Release-focused; limited metadata |
+| Marvel | `https://gateway.marvel.com/v1/public/` | API key | Official Marvel API |
+| DC | No official public API | — | Use ComicVine for DC issues |
+
+---
+
+## Scalar Fields
+
+| Canonical Field | ComicVine | Metron | GCD | LOCG | ComicInfo.xml | Shortboxed | Marvel |
+|---|---|---|---|---|---|---|---|
+| `title` | `name` | `name` | `title` | `name` | `Title` | `title` | `title` |
+| `series` | `volumeInformation.name` | `series.name` | `series_name` | TBD | `Series` | TBD | `series.name` |
+| `issueNumber` | `issue_number` | `number` | `number` | TBD | `Number` | TBD | `issueNumber` |
+| `volume` | `volume.name` | `series.volume` | `volume` | TBD | `Volume` | TBD | TBD |
+| `publisher` | `volumeInformation.publisher.name` | `publisher.name` | `indicia_publisher` | `publisher` | `Publisher` | `publisher` | `"Marvel"` (static) |
+| `imprint` | TBD | `imprint.name` | `brand_emblem` | TBD | `Imprint` | TBD | TBD |
+| `coverDate` | `cover_date` | `cover_date` | `key_date` | TBD | `CoverDate` | TBD | `dates[onsaleDate].date` |
+| `publicationDate` | `store_date` | `store_date` | `on_sale_date` | TBD | TBD | `release_date` | `dates[focDate].date` |
+| `description` | `description` | `desc` | `story_set[0].synopsis` | `description` | `Summary` | `description` | `description` |
+| `notes` | TBD | TBD | `notes` | TBD | `Notes` | TBD | TBD |
+| `pageCount` | TBD | `page_count` | `page_count` | TBD | `PageCount` | TBD | `pageCount` |
+| `ageRating` | TBD | `rating.name` | `rating` | TBD | `AgeRating` | TBD | TBD |
+| `format` | TBD | `series.series_type.name` | `story_set[0].type` | TBD | `Format` | TBD | `format` |
+| `communityRating` | TBD | TBD | TBD | `rating` | TBD | TBD | TBD |
+| `coverImage` | `image.original_url` | `image` | `cover` | `cover` | TBD | TBD | `thumbnail.path + "." + thumbnail.extension` |
+
+---
+
+## Array / Nested Fields
+
+GCD creator credits live as free-text strings inside `story_set[0]` (e.g. `"script": "Grant Morrison, Peter Milligan"`), not as structured arrays. These need to be split on commas during mapping.
+
+| Canonical Field | ComicVine | Metron | GCD | LOCG | ComicInfo.xml | Shortboxed | Marvel |
+|---|---|---|---|---|---|---|---|
+| `creators` (writer) | `person_credits[role=writer]` | `credits[role=writer]` | `story_set[0].script` | TBD | `Writer` | `creators` | `creators.items[role=writer]` |
+| `creators` (penciller) | `person_credits[role=penciller]` | `credits[role=penciller]` | `story_set[0].pencils` | TBD | `Penciller` | TBD | `creators.items[role=penciler]` |
+| `creators` (inker) | `person_credits[role=inker]` | `credits[role=inker]` | `story_set[0].inks` | TBD | `Inker` | TBD | `creators.items[role=inker]` |
+| `creators` (colorist) | `person_credits[role=colorist]` | `credits[role=colorist]` | `story_set[0].colors` | TBD | `Colorist` | TBD | `creators.items[role=colorist]` |
+| `creators` (letterer) | `person_credits[role=letterer]` | `credits[role=letterer]` | `story_set[0].letters` | TBD | `Letterer` | TBD | `creators.items[role=letterer]` |
+| `creators` (editor) | `person_credits[role=editor]` | `credits[role=editor]` | `story_set[0].editing` | TBD | `Editor` | TBD | `creators.items[role=editor]` |
+| `characters` | `character_credits` | `characters` | `story_set[0].characters` | TBD | `Characters` | TBD | `characters.items` |
+| `teams` | `team_credits` | `teams` | TBD | TBD | `Teams` | TBD | TBD |
+| `locations` | `location_credits` | `locations` | TBD | TBD | `Locations` | TBD | TBD |
+| `storyArcs` | `story_arc_credits` | `arcs` | TBD | TBD | `StoryArc` | TBD | `events.items` |
+| `stories` | TBD | TBD | `story_set[].title` | TBD | TBD | TBD | `stories.items` |
+| `genres` | TBD | `series.genres` | `story_set[0].genre` | TBD | `Genre` | TBD | TBD |
+| `tags` | TBD | TBD | `story_set[0].keywords` | TBD | `Tags` | TBD | TBD |
+| `universes` | TBD | TBD | TBD | TBD | TBD | TBD | TBD |
+| `reprints` | TBD | `reprints` | TBD | TBD | TBD | TBD | TBD |
+| `urls` | `site_detail_url` | `resource_url` | `api_url` | `url` | TBD | TBD | `urls[type=detail].url` |
+| `prices` | `price` | TBD | `price` | `price` | `Price` | `price` | `prices[type=printPrice].price` |
+| `externalIDs` | `id` | `id` | `api_url` | TBD | TBD | `diamond_id` | `id` |
+
+---
+
+## Identifiers / GTINs
+
+| Canonical Field | ComicVine | Metron | GCD | LOCG | ComicInfo.xml | Shortboxed | Marvel |
+|---|---|---|---|---|---|---|---|
+| `gtin.isbn` | TBD | TBD | `isbn` | TBD | TBD | TBD | `isbn` |
+| `gtin.upc` | TBD | TBD | `barcode` | TBD | TBD | TBD | `upc` |
+
+---
+
+## Special Mapping Notes
+
+- **DC Comics**: No official public API. DC issue metadata is sourced via **ComicVine** (which has comprehensive DC coverage). There is no separate `dc` source key.
+- **GCD creators**: All credit fields (`script`, `pencils`, `inks`, `colors`, `letters`, `editing`) are comma-separated strings inside `story_set[0]`. Mapping code must split these into individual creator objects with roles assigned.
+- **GCD characters/genre/keywords**: Also inside `story_set[0]`, not top-level on the issue.
+- **Marvel publisher**: Always "Marvel Comics" — can be set as a static value rather than extracted from the API response.
+- **Marvel cover image**: Constructed by concatenating `thumbnail.path + "." + thumbnail.extension`.
+- **Marvel dates**: Multiple date types in a `dates[]` array — filter by `type == "onsaleDate"` for cover date, `type == "focDate"` for FOC/publication date.
+- **Marvel creators/characters**: Nested inside collection objects (`creators.items[]`, `characters.items[]`) with `name` and `role` sub-fields.
+- **Shortboxed**: Release-focused service; limited metadata. Best used for `publicationDate`, `price`, and `publisher` only. No series/issue number fields.
+- **LOCG**: No public API; fields marked TBD will need to be confirmed when integration is built.
diff --git a/docs/METADATA_RECONCILIATION_PLAN.md b/docs/METADATA_RECONCILIATION_PLAN.md
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+# Metadata Reconciliation System Plan
+
+## Context
+
+Comics in the library can have metadata from multiple sources: ComicVine, Metron, GCD, LOCG, ComicInfo.xml, Shortboxed, Marvel, DC, and Manual. The existing `canonicalMetadata` + `sourcedMetadata` architecture already stores raw per-source data and has a resolution algorithm, but there's no way for a user to interactively compare and cherry-pick values across sources field-by-field. This plan adds that manual reconciliation workflow (Phase 1) and lays the groundwork for ranked auto-resolution (Phase 2).
+
+---
+
+## Current State (what already exists)
+
+- `sourcedMetadata.{comicvine,metron,gcd,locg,comicInfo}` — raw per-source data (Mongoose Mixed) — **Shortboxed, Marvel, DC not yet added**
+- `canonicalMetadata` — resolved truth, each field is `{ value, provenance, userOverride }`
+- `analyzeMetadataConflicts(comicId)` GraphQL query — conflict view for 5 fields only
+- `setMetadataField(comicId, field, value)` — stores MANUAL override with raw string
+- `resolveMetadata(comicId)` / `bulkResolveMetadata(comicIds)` — trigger auto-resolution
+- `previewCanonicalMetadata(comicId, preferences)` — dry run
+- `buildCanonicalMetadata()` in `utils/metadata.resolution.utils.ts` — covers only 7 fields
+- `UserPreferences` model with `sourcePriorities`, `conflictResolution`, `autoMerge`
+- `updateUserPreferences` resolver — fully implemented
+- `autoResolveMetadata()` in `services/graphql.service.ts` — exists but only for scalar triggers
+
+---
+
+## Phase 1: Manual Cherry-Pick Reconciliation
+
+### Goal
+For any comic, a user can open a comparison table: each row is a canonical field, each column is a source. They click a cell to "pick" that source's value for that field. The result is stored as `canonicalMetadata.<field>` with the original source's provenance intact and `userOverride: true` to prevent future auto-resolution from overwriting it.
+
+### Expand `MetadataSource` enum (`models/comic.model.ts` + `models/graphql/typedef.ts`)
+
+Add new sources to the enum:
+
+```ts
+enum MetadataSource {
+  COMICVINE       = "comicvine",
+  METRON          = "metron",
+  GRAND_COMICS_DATABASE = "gcd",
+  LOCG            = "locg",
+  COMICINFO_XML   = "comicinfo",
+  SHORTBOXED      = "shortboxed",
+  MARVEL          = "marvel",
+  DC              = "dc",
+  MANUAL          = "manual",
+}
+```
+
+Also add to `sourcedMetadata` in `ComicSchema` (`models/comic.model.ts`):
+```ts
+shortboxed: { type: mongoose.Schema.Types.Mixed, default: {} },
+marvel:     { type: mongoose.Schema.Types.Mixed, default: {} },
+dc:         { type: mongoose.Schema.Types.Mixed, default: {} },
+```
+
+And in GraphQL schema enum:
+```graphql
+enum MetadataSource {
+  COMICVINE
+  METRON
+  GRAND_COMICS_DATABASE
+  LOCG
+  COMICINFO_XML
+  SHORTBOXED
+  MARVEL
+  DC
+  MANUAL
+}
+```
+
+> **Note:** Shortboxed, Marvel, and DC field paths in `SOURCE_FIELD_PATHS` will be stubs (`{}`) until those integrations are built. The comparison view will simply show no data for those sources until then — no breaking changes.
+
+---
+
+### New types (GraphQL — `models/graphql/typedef.ts`)
+
+```graphql
+# One source's value for a single field
+type SourceFieldValue {
+  source: MetadataSource!
+  value: JSON            # null if source has no value for this field
+  confidence: Float
+  fetchedAt: String
+  url: String
+}
+
+# All sources' values for a single canonical field
+type MetadataFieldComparison {
+  field: String!
+  currentCanonical: MetadataField  # what is currently resolved
+  sourcedValues: [SourceFieldValue!]!  # one entry per source that has data
+  hasConflict: Boolean!            # true if >1 source has a different value
+}
+
+type MetadataComparisonView {
+  comicId: ID!
+  comparisons: [MetadataFieldComparison!]!
+}
+```
+
+Add to `Query`:
+```graphql
+getMetadataComparisonView(comicId: ID!): MetadataComparisonView!
+```
+
+Add to `Mutation`:
+```graphql
+# Cherry-pick a single field from a named source
+pickFieldFromSource(comicId: ID!, field: String!, source: MetadataSource!): Comic!
+
+# Batch cherry-pick multiple fields at once
+batchPickFieldsFromSources(
+  comicId: ID!
+  picks: [FieldSourcePick!]!
+): Comic!
+
+input FieldSourcePick {
+  field: String!
+  source: MetadataSource!
+}
+```
+
+### Changes to `utils/metadata.resolution.utils.ts`
+
+Add `SOURCE_FIELD_PATHS` — a complete mapping of every canonical field to its path in each sourced-metadata blob:
+
+```ts
+export const SOURCE_FIELD_PATHS: Record<
+  string,         // canonical field name
+  Partial<Record<MetadataSource, string>>  // source → dot-path in sourcedMetadata[source]
+> = {
+  title:         { comicvine: "name", metron: "name", comicinfo: "Title", locg: "name" },
+  series:        { comicvine: "volumeInformation.name", comicinfo: "Series" },
+  issueNumber:   { comicvine: "issue_number", metron: "number", comicinfo: "Number" },
+  publisher:     { comicvine: "volumeInformation.publisher.name", locg: "publisher", comicinfo: "Publisher" },
+  coverDate:     { comicvine: "cover_date", metron: "cover_date", comicinfo: "CoverDate" },
+  description:   { comicvine: "description", locg: "description", comicinfo: "Summary" },
+  pageCount:     { comicinfo: "PageCount", metron: "page_count" },
+  ageRating:     { comicinfo: "AgeRating", metron: "rating.name" },
+  format:        { metron: "series.series_type.name", comicinfo: "Format" },
+  // creators → array field, handled separately
+  storyArcs:     { comicvine: "story_arc_credits", metron: "arcs", comicinfo: "StoryArc" },
+  characters:    { comicvine: "character_credits", metron: "characters", comicinfo: "Characters" },
+  teams:         { comicvine: "team_credits", metron: "teams", comicinfo: "Teams" },
+  locations:     { comicvine: "location_credits", metron: "locations", comicinfo: "Locations" },
+  genres:        { metron: "series.genres", comicinfo: "Genre" },
+  tags:          { comicinfo: "Tags" },
+  communityRating: { locg: "rating" },
+  coverImage:    { comicvine: "image.original_url", locg: "cover", metron: "image" },
+  // Shortboxed, Marvel, DC — paths TBD when integrations are built
+  // shortboxed: {},  marvel: {},  dc: {}
+};
+```
+
+Add `extractAllSourceValues(field, sourcedMetadata)` — returns `SourceFieldValue[]` for every source that has a non-null value for the given field.
+
+Update `buildCanonicalMetadata()` to use `SOURCE_FIELD_PATHS` instead of the hard-coded 7-field mapping. This single source of truth drives both auto-resolve and the comparison view.
+
+### Changes to `models/graphql/resolvers.ts`
+
+**`getMetadataComparisonView` resolver:**
+- Fetch comic by ID
+- For each key in `SOURCE_FIELD_PATHS`, call `extractAllSourceValues()`
+- Return the comparison array with `hasConflict` flag
+- Include `currentCanonical` from `comic.canonicalMetadata[field]` if it exists
+
+**`pickFieldFromSource` resolver:**
+- Fetch comic, validate source has a value for the field
+- Extract value + provenance from `sourcedMetadata[source]` via `SOURCE_FIELD_PATHS`
+- Write to `canonicalMetadata[field]` with original source provenance + `userOverride: true`
+- Save and return comic
+
+**`batchPickFieldsFromSources` resolver:**
+- Same as above but iterate over `picks[]`, do a single `comic.save()`
+
+### Changes to `services/library.service.ts`
+
+Add Moleculer actions that delegate to GraphQL:
+
+```ts
+getMetadataComparisonView: {
+  rest: "POST /getMetadataComparisonView",
+  async handler(ctx) { /* call GraphQL query */ }
+},
+pickFieldFromSource: {
+  rest: "POST /pickFieldFromSource",
+  async handler(ctx) { /* call GraphQL mutation */ }
+},
+batchPickFieldsFromSources: {
+  rest: "POST /batchPickFieldsFromSources",
+  async handler(ctx) { /* call GraphQL mutation */ }
+},
+```
+
+### Changes to `utils/import.graphql.utils.ts`
+
+Add three helper functions mirroring the pattern of existing utils:
+- `getMetadataComparisonViewViaGraphQL(broker, comicId)`
+- `pickFieldFromSourceViaGraphQL(broker, comicId, field, source)`
+- `batchPickFieldsFromSourcesViaGraphQL(broker, comicId, picks)`
+
+---
+
+## Architectural Guidance: GraphQL vs REST
+
+The project has two distinct patterns — use the right one:
+
+| Type of operation | Pattern |
+|---|---|
+| Complex metadata logic (resolution, provenance, conflict analysis) | **GraphQL mutation/query** in `typedef.ts` + `resolvers.ts` |
+| User-facing operation the UI calls | **REST action** in `library.service.ts` → delegates to GraphQL via `broker.call("graphql.graphql", {...})` |
+| Pure acquisition tracking (no resolution) | Direct DB write in `library.service.ts`, no GraphQL needed |
+
+**All three new reconciliation operations** (`getMetadataComparisonView`, `pickFieldFromSource`, `batchPickFieldsFromSources`) follow the first two rows: GraphQL for the logic + REST wrapper for UI consumption.
+
+### Gap: `applyComicVineMetadata` bypasses canonicalMetadata
+
+Currently `library.applyComicVineMetadata` writes directly to `sourcedMetadata.comicvine` in MongoDB without triggering `buildCanonicalMetadata`. This means `canonicalMetadata` goes stale when ComicVine data is applied.
+
+The fix: change `applyComicVineMetadata` to call the existing `updateSourcedMetadata` GraphQL mutation instead of the direct DB write. `updateSourcedMetadata` already triggers re-resolution via `autoMerge.onMetadataUpdate`.
+
+**File**: `services/library.service.ts` lines ~937–990 (applyComicVineMetadata handler)
+**Change**: Replace direct `Comic.findByIdAndUpdate` with `broker.call("graphql.graphql", { query: updateSourcedMetadataMutation, ... })`
+
+---
+
+## Phase 2: Source Ranking + AutoResolve (design — not implementing yet)
+
+The infrastructure already exists:
+- `UserPreferences.sourcePriorities[]` with per-source `priority` (1=highest)
+- `conflictResolution` strategy enum (PRIORITY, CONFIDENCE, RECENCY, HYBRID, MANUAL)
+- `autoMerge.enabled / onImport / onMetadataUpdate`
+- `updateUserPreferences` resolver
+
+When this phase is implemented, the additions will be:
+1. A "re-resolve all comics" action triggered when source priorities change (`POST /reResolveAllWithPreferences`)
+2. `autoResolveMetadata` in graphql.service.ts wired to call `resolveMetadata` on save rather than only on import/update hooks
+3. Field-specific source overrides UI (the `fieldOverrides` Map in `SourcePrioritySchema` is already modeled)
+
+---
+
+## TDD Approach
+
+Each step follows Red → Green → Refactor:
+1. Write failing spec(s) for the unit being built
+2. Implement the minimum code to make them pass
+3. Refactor if needed
+
+**Test framework:** Jest + ts-jest (configured in `package.json`, zero existing tests — these will be the first)
+**File convention:** `*.spec.ts` alongside the source file (e.g., `utils/metadata.resolution.utils.spec.ts`)
+**No DB needed for unit tests** — mock `Comic.findById` etc. with `jest.spyOn` / `jest.mock`
+
+---
+
+## Implementation Order
+
+### Step 1 — Utility layer (prerequisite for everything)
+**Write first:** `utils/metadata.resolution.utils.spec.ts`
+- `SOURCE_FIELD_PATHS` has entries for all canonical fields
+- `extractAllSourceValues("title", { comicvine: { name: "A" }, metron: { name: "B" } })` returns 2 entries with correct source + value
+- `extractAllSourceValues` returns empty array when no source has the field
+- `buildCanonicalMetadata()` covers all fields in `SOURCE_FIELD_PATHS` (not just 7)
+- `buildCanonicalMetadata()` never overwrites fields with `userOverride: true`
+
+**Then implement:**
+- `models/comic.model.ts` — add `SHORTBOXED`, `MARVEL`, `DC` to `MetadataSource` enum; add 3 new `sourcedMetadata` fields
+- `models/userpreferences.model.ts` — add SHORTBOXED (priority 7), MARVEL (8), DC (9) to default `sourcePriorities`
+- `utils/metadata.resolution.utils.ts` — add `SOURCE_FIELD_PATHS`, `extractAllSourceValues()`, rewrite `buildCanonicalMetadata()`
+
+### Step 2 — GraphQL schema (no tests — type definitions only)
+**`models/graphql/typedef.ts`**
+- Expand `MetadataSource` enum (add SHORTBOXED, MARVEL, DC)
+- Add `SourceFieldValue`, `MetadataFieldComparison`, `MetadataComparisonView`, `FieldSourcePick` types
+- Add `getMetadataComparisonView` to `Query`
+- Add `pickFieldFromSource`, `batchPickFieldsFromSources` to `Mutation`
+
+### Step 3 — GraphQL resolvers
+**Write first:** `models/graphql/resolvers.spec.ts`
+- `getMetadataComparisonView`: returns one entry per field in `SOURCE_FIELD_PATHS`; `hasConflict` true when sources disagree; `currentCanonical` reflects DB state
+- `pickFieldFromSource`: sets field with source provenance + `userOverride: true`; throws when source has no value
+- `batchPickFieldsFromSources`: applies all picks in a single save
+- `applyComicVineMetadata` fix: calls `updateSourcedMetadata` mutation (not direct DB write)
+
+**Then implement:** `models/graphql/resolvers.ts`
+
+### Step 4 — GraphQL util helpers
+**Write first:** `utils/import.graphql.utils.spec.ts`
+- Each helper calls `broker.call("graphql.graphql", ...)` with correct query/variables
+- GraphQL errors are propagated
+
+**Then implement:** `utils/import.graphql.utils.ts`
+
+### Step 5 — REST surface
+**Write first:** `services/library.service.spec.ts`
+- Each action delegates to the correct GraphQL util helper
+- Context params pass through correctly
+
+**Then implement:** `services/library.service.ts`
+
+---
+
+## Critical Files
+
+| File | Step | Change |
+|---|---|---|
+| `models/comic.model.ts` | 1 | Add `SHORTBOXED`, `MARVEL`, `DC` to `MetadataSource` enum; add 3 new `sourcedMetadata` fields |
+| `models/userpreferences.model.ts` | 1 | Add SHORTBOXED (priority 7), MARVEL (8), DC (9) to default `sourcePriorities` |
+| `utils/metadata.resolution.utils.ts` | 1 | Add `SOURCE_FIELD_PATHS`, `extractAllSourceValues()`; rewrite `buildCanonicalMetadata()` |
+| `models/graphql/typedef.ts` | 2 | Expand `MetadataSource` enum; add 4 new types + query + 2 mutations |
+| `models/graphql/resolvers.ts` | 3 | Implement 3 resolvers + fix `applyComicVineMetadata` |
+| `utils/import.graphql.utils.ts` | 4 | Add 3 GraphQL util functions |
+| `services/library.service.ts` | 5 | Add 3 Moleculer REST actions |
+
+---
+
+## Reusable Existing Code
+
+- `resolveMetadataField()` in `utils/metadata.resolution.utils.ts` — reused inside `buildCanonicalMetadata()`
+- `getNestedValue()` in same file — reused in `extractAllSourceValues()`
+- `convertPreferences()` in `models/graphql/resolvers.ts` — reused in `getMetadataComparisonView`
+- `autoResolveMetadata()` in `services/graphql.service.ts` — called after `pickFieldFromSource` if `autoMerge.onMetadataUpdate` is true
+
+---
+
+## Verification
+
+1. **Unit**: `extractAllSourceValues("title", { comicvine: { name: "A" }, metron: { name: "B" } })` → 2 entries with correct provenance
+2. **GraphQL**: `getMetadataComparisonView(comicId)` on a comic with comicvine + comicInfo data → all fields populated
+3. **Cherry-pick**: `pickFieldFromSource(comicId, "title", COMICVINE)` → `canonicalMetadata.title.provenance.source == "comicvine"` and `userOverride == true`
+4. **Batch**: `batchPickFieldsFromSources` with 3 fields → single DB write, all 3 updated
+5. **Lock**: After cherry-picking, `resolveMetadata(comicId)` must NOT overwrite picked fields (`userOverride: true` takes priority)
+6. **REST**: `POST /api/library/getMetadataComparisonView` returns expected JSON