diff --git a/docs/api/openapi.yaml b/docs/api/openapi.yaml
index 138854254..2ac1e174b 100644
--- a/docs/api/openapi.yaml
+++ b/docs/api/openapi.yaml
@@ -33209,8 +33209,18 @@ components:
           type: array
           items:
             $ref: "#/components/schemas/JsonImportMoodEntry"
-      description: "JSON import payload: the measurements and mood entries of the JSON export or the portable full backup.
-        Both sections optional; up to 10 000 rows each."
+        customMoodTagCategories:
+          maxItems: 10000
+          type: array
+          items:
+            $ref: "#/components/schemas/JsonImportMoodTagCategory"
+        customMoodTags:
+          maxItems: 10000
+          type: array
+          items:
+            $ref: "#/components/schemas/JsonImportMoodTag"
+      description: "JSON import payload: the measurements and mood entries of the JSON export or the portable full backup, and
+        the backup's own mood vocabulary the entries link to. Every section optional; up to 10 000 rows each."
     JsonImportMeasurement:
       type: object
       properties:
@@ -33346,8 +33356,9 @@ components:
           type: string
           maxLength: 64
         factors:
-          description: Rated factors by catalogue key; replaces the entry's rated links. A key the account cannot resolve is
-            dropped and named in `droppedFactorKeys`; a rating outside the factor's own scale skips the entry.
+          description: Rated factors by key (the catalogue's, or the account's own as for `structuredTags`); replaces the entry's
+            rated links. A key the account cannot resolve is dropped and named in `droppedFactorKeys`; a rating outside
+            the factor's own scale skips the entry.
           maxItems: 30
           type: array
           items:
@@ -33364,8 +33375,8 @@ components:
               - key
               - rating
         structuredTags:
-          description: Ticked tags by key (the catalogue or the account's own); replaces the entry's tag links. An unresolvable
-            key is dropped and named in `droppedTagKeys`.
+          description: Ticked tags by key (the catalogue, the account's own, or one the file's `customMoodTags` brings); replaces
+            the entry's tag links. An unresolvable key is dropped and named in `droppedTagKeys`.
           maxItems: 30
           type: array
           items:
@@ -33538,6 +33549,100 @@ components:
         - mood
         - score
       description: One mood-entry row of a JSON import file.
+    JsonImportMoodTagCategory:
+      type: object
+      properties:
+        id:
+          description: The file's own id, read only to find the group a tag names in `categoryId`.
+          type: string
+          maxLength: 120
+        key:
+          type: string
+          minLength: 1
+          maxLength: 80
+        labelKey:
+          type: string
+          minLength: 1
+          maxLength: 120
+        icon:
+          type: string
+          maxLength: 60
+        sortOrder:
+          type: integer
+          minimum: -9007199254740991
+          maximum: 9007199254740991
+        isActive:
+          type: boolean
+        label:
+          description: The group's own name.
+          type: string
+          maxLength: 200
+        labelEncrypted:
+          description: A disaster-recovery file's sealed name, used only when this server's keys open it.
+          type: string
+          maxLength: 2000
+      required:
+        - key
+        - labelKey
+      description: "A mood-tag group the account made itself. Matched by `key`: a group the account has is used as it is, a
+        missing one is created."
+    JsonImportMoodTag:
+      type: object
+      properties:
+        key:
+          type: string
+          minLength: 1
+          maxLength: 80
+        labelKey:
+          type: string
+          minLength: 1
+          maxLength: 120
+        categoryId:
+          type: string
+          minLength: 1
+          maxLength: 120
+          description: The group's id in the file; a group the file does not carry falls back to the seeded `custom` group.
+        kind:
+          type: string
+          enum:
+            - BINARY
+            - RATED
+        isActive:
+          type: boolean
+        icon:
+          type: string
+          maxLength: 60
+        sortOrder:
+          type: integer
+          minimum: -9007199254740991
+          maximum: 9007199254740991
+        label:
+          description: The tag's own name.
+          type: string
+          maxLength: 200
+        labelEncrypted:
+          description: A disaster-recovery file's sealed name, used only when this server's keys open it.
+          type: string
+          maxLength: 2000
+        scaleMin:
+          type: integer
+          minimum: 0
+          maximum: 10
+        scaleMax:
+          type: integer
+          minimum: 0
+          maximum: 10
+        inverse:
+          type: boolean
+      required:
+        - key
+        - labelKey
+        - categoryId
+        - kind
+      description: "A mood tag the account made itself, a rated factor included. Matched by `key`: the account's own tag of
+        that key is used and never overwritten (a different label is named in `keptMoodTagKeys`); a missing one is
+        created, within the account's custom-tag cap; a key another account of this server holds comes over under a key
+        derived from the account and the file's key, so a second import of the same file finds it."
     MeasurementReminderCreate:
       type: object
       properties:
@@ -74085,6 +74190,17 @@ components:
           type: array
           items:
             type: string
+        keptMoodTagKeys:
+          description: Keys of the account's own tags the file names differently. The account's tag is kept as it is. Present only
+            when non-empty.
+          type: array
+          items:
+            type: string
+        keptMoodCategoryKeys:
+          description: The same, for the account's own tag groups.
+          type: array
+          items:
+            type: string
       required:
         - measurements
         - moodEntries
diff --git a/docs/integrations/data-import.md b/docs/integrations/data-import.md
index f53fc3e33..af378a9d3 100644
--- a/docs/integrations/data-import.md
+++ b/docs/integrations/data-import.md
@@ -72,10 +72,17 @@ in the backup and `""` in the export, reads as absent, a backup's deletion
 records are skipped and counted, and a reading in a display unit (lb, °F,
 mmol/L) is converted to the stored one.
 
-A mood entry's tags and rated factors are linked by key. A key the
-importing account has no tag for, typically a tag another account made
-for itself, is dropped from that entry, and the response names it in
-`droppedTagKeys` or `droppedFactorKeys`. The rest of the entry lands.
+A mood entry's tags and rated factors are linked by key. A full backup
+also carries the account's own tags, rated factors and tag groups, and the
+import brings them along: a tag the importing account already has is used
+as it is, and one it lacks is created (within the account's limit of 50
+custom tags and 12 groups). The account's own tag is never overwritten: when
+the file names it differently, the account's name stays and the response
+lists the key in `keptMoodTagKeys` (`keptMoodCategoryKeys` for a group).
+Moving a file between two accounts of one server works too; the tags come
+over under keys of their own. A key the account cannot resolve at all is
+dropped from that entry and named in `droppedTagKeys` or
+`droppedFactorKeys`, and the rest of the entry lands.
 
 ### Measurement entry
 
diff --git a/messages/de.json b/messages/de.json
index 69916f438..102a530a2 100644
--- a/messages/de.json
+++ b/messages/de.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "{measurements} Messwerte und {moods} Stimmungseinträge importiert, {skipped} übersprungen.",
             "resultSuccess": "{measurements} Messwerte und {moods} Stimmungseinträge importiert",
             "droppedLinks": "Ohne diese Tags importiert, weil dieses Konto keine mit dem Namen hat: {keys}",
+            "keptLabels": "Dieses Konto hat Tags oder Gruppen mit diesen Schlüsseln schon unter eigenem Namen, die wurden behalten: {keys}",
             "resultNothing": "Nichts importiert. Alle {skipped} Einträge wurden übersprungen.",
             "resultEmpty": "Diese Datei enthielt weder Messwerte noch Stimmungseinträge."
           },
diff --git a/messages/en.json b/messages/en.json
index 4d70f02d0..da5a32d20 100644
--- a/messages/en.json
+++ b/messages/en.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "Imported {measurements} measurements and {moods} mood entries, {skipped} skipped.",
             "resultSuccess": "Imported {measurements} measurements and {moods} mood entries",
             "droppedLinks": "Imported without these tags, because this account has none by that name: {keys}",
+            "keptLabels": "This account already has tags or groups with these keys under its own names, so those were kept: {keys}",
             "resultNothing": "Nothing was imported. All {skipped} entries were skipped.",
             "resultEmpty": "That file carried no measurements and no mood entries."
           },
diff --git a/messages/es.json b/messages/es.json
index 879ccea71..4e55bf123 100644
--- a/messages/es.json
+++ b/messages/es.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "{measurements} mediciones y {moods} entradas de ánimo importadas, {skipped} omitidas.",
             "resultSuccess": "{measurements} mediciones y {moods} entradas de ánimo importadas",
             "droppedLinks": "Importado sin estas etiquetas, porque esta cuenta no tiene ninguna con ese nombre: {keys}",
+            "keptLabels": "Esta cuenta ya tiene etiquetas o grupos con estas claves y con su propio nombre, así que se han conservado: {keys}",
             "resultNothing": "No se importó nada. Se omitieron las {skipped} entradas.",
             "resultEmpty": "Ese archivo no contenía mediciones ni entradas de ánimo."
           },
diff --git a/messages/fr.json b/messages/fr.json
index 5105b4b79..0d1b503e9 100644
--- a/messages/fr.json
+++ b/messages/fr.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "{measurements} mesures et {moods} entrées d'humeur importées, {skipped} ignorées.",
             "resultSuccess": "{measurements} mesures et {moods} entrées d'humeur importées",
             "droppedLinks": "Importé sans ces étiquettes, car ce compte n’en a aucune de ce nom : {keys}",
+            "keptLabels": "Ce compte a déjà des étiquettes ou des groupes avec ces clés sous son propre nom, ils ont été conservés : {keys}",
             "resultNothing": "Rien n'a été importé. Les {skipped} entrées ont toutes été ignorées.",
             "resultEmpty": "Ce fichier ne contenait ni mesures ni entrées d'humeur."
           },
diff --git a/messages/it.json b/messages/it.json
index ffcbd71a8..8067e9aa9 100644
--- a/messages/it.json
+++ b/messages/it.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "{measurements} misurazioni e {moods} voci dell'umore importate, {skipped} saltate.",
             "resultSuccess": "{measurements} misurazioni e {moods} voci dell'umore importate",
             "droppedLinks": "Importato senza questi tag, perché questo account non ne ha nessuno con quel nome: {keys}",
+            "keptLabels": "Questo account ha già tag o gruppi con queste chiavi e con il proprio nome, quindi sono stati mantenuti: {keys}",
             "resultNothing": "Non è stato importato nulla. Tutte le {skipped} voci sono state saltate.",
             "resultEmpty": "Questo file non conteneva né misurazioni né voci dell'umore."
           },
diff --git a/messages/ko.json b/messages/ko.json
index 7a90ee3e6..842d0ab87 100644
--- a/messages/ko.json
+++ b/messages/ko.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "측정 {measurements}개와 기분 기록 {moods}개를 불러왔고, {skipped}개는 건너뛰었어요.",
             "resultSuccess": "측정 {measurements}개와 기분 기록 {moods}개를 불러왔어요",
             "droppedLinks": "이 계정에 같은 이름의 태그가 없어 다음 태그 없이 가져왔습니다: {keys}",
+            "keptLabels": "이 계정에는 이미 같은 키의 태그나 그룹이 자체 이름으로 있어서 그대로 유지했어요: {keys}",
             "resultNothing": "불러온 게 없어요. {skipped}개 기록을 모두 건너뛰었어요.",
             "resultEmpty": "그 파일에는 측정도 기분 기록도 없었어요."
           },
diff --git a/messages/nl.json b/messages/nl.json
index 1d791cffe..44163c4a2 100644
--- a/messages/nl.json
+++ b/messages/nl.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "{measurements} metingen en {moods} stemmingsregistraties geïmporteerd, {skipped} overgeslagen.",
             "resultSuccess": "{measurements} metingen en {moods} stemmingsregistraties geïmporteerd",
             "droppedLinks": "Geïmporteerd zonder deze tags, omdat dit account er geen met die naam heeft: {keys}",
+            "keptLabels": "Dit account heeft al tags of groepen met deze sleutels onder een eigen naam, die zijn behouden: {keys}",
             "resultNothing": "Er is niets geïmporteerd. Alle {skipped} registraties zijn overgeslagen.",
             "resultEmpty": "Dat bestand bevatte geen metingen en geen stemmingsregistraties."
           },
diff --git a/messages/pl.json b/messages/pl.json
index 85ddb378c..5b215e72f 100644
--- a/messages/pl.json
+++ b/messages/pl.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "Zaimportowano {measurements} pomiarów i {moods} wpisów nastroju, pominięto {skipped}.",
             "resultSuccess": "Zaimportowano {measurements} pomiarów i {moods} wpisów nastroju",
             "droppedLinks": "Zaimportowano bez tych tagów, bo to konto nie ma żadnego o tej nazwie: {keys}",
+            "keptLabels": "To konto ma już tagi lub grupy z tymi kluczami pod własną nazwą, więc zostały zachowane: {keys}",
             "resultNothing": "Nic nie zaimportowano. Pominięto wszystkie {skipped} wpisów.",
             "resultEmpty": "Ten plik nie zawierał pomiarów ani wpisów nastroju."
           },
diff --git a/messages/pt-BR.json b/messages/pt-BR.json
index 191340d81..60977cca7 100644
--- a/messages/pt-BR.json
+++ b/messages/pt-BR.json
@@ -5795,6 +5795,7 @@
             "resultSummary": "Importadas {measurements} medições e {moods} registros de humor, {skipped} pulados.",
             "resultSuccess": "Importadas {measurements} medições e {moods} registros de humor",
             "droppedLinks": "Importado sem estas tags, porque esta conta não tem nenhuma com esse nome: {keys}",
+            "keptLabels": "Esta conta já tem tags ou grupos com essas chaves e com nome próprio, então eles foram mantidos: {keys}",
             "resultNothing": "Nada foi importado. Todas as {skipped} entradas foram puladas.",
             "resultEmpty": "Esse arquivo não continha medições nem registros de humor."
           },
diff --git a/src/__tests__/json-import-openapi-parity.test.ts b/src/__tests__/json-import-openapi-parity.test.ts
index 7fe77d326..70e749d98 100644
--- a/src/__tests__/json-import-openapi-parity.test.ts
+++ b/src/__tests__/json-import-openapi-parity.test.ts
@@ -13,6 +13,9 @@ import {
   jsonImportMeasurementSchema,
   jsonImportMoodContextSchema,
   jsonImportMoodEntrySchema,
+  jsonImportMoodTagCategorySchema,
+  jsonImportMoodTagSchema,
+  jsonImportSchema,
 } from "@/lib/import/json/schema";
 import { buildOpenApiDocument } from "@/lib/openapi/registry";
 
@@ -63,6 +66,18 @@ describe("the published JSON import contract", () => {
     expect(fields).toEqual(Object.keys(jsonImportMoodEntrySchema.shape).sort());
   });
 
+  it("names every section and every vocabulary field the import reads", () => {
+    expect(documented("JsonImportRequest")).toEqual(
+      Object.keys(jsonImportSchema.shape).sort(),
+    );
+    expect(documented("JsonImportMoodTag")).toEqual(
+      Object.keys(jsonImportMoodTagSchema.shape).sort(),
+    );
+    expect(documented("JsonImportMoodTagCategory")).toEqual(
+      Object.keys(jsonImportMoodTagCategorySchema.shape).sort(),
+    );
+  });
+
   it("names every day-context field the import reads, and no other", () => {
     const entry = resolve(doc.components.schemas.JsonImportMoodEntry!);
     const context = resolve(entry.properties!.context!);
diff --git a/src/app/api/import/route.ts b/src/app/api/import/route.ts
index ccf6fe068..7c183775f 100644
--- a/src/app/api/import/route.ts
+++ b/src/app/api/import/route.ts
@@ -56,10 +56,14 @@ export const POST = apiHandler(async (request: NextRequest) => {
     stats: written,
     writeFailed,
     droppedLinkKeys,
+    keptMoodTagKeys,
+    keptMoodCategoryKeys,
   } = await runJsonImport({
     userId: user.id,
     measurements: parsed.data.measurements,
     moodEntries: parsed.data.moodEntries,
+    customMoodTagCategories: parsed.data.customMoodTagCategories,
+    customMoodTags: parsed.data.customMoodTags,
     ipAddress: getClientIp(request),
   });
   const stats = {
@@ -68,6 +72,10 @@ export const POST = apiHandler(async (request: NextRequest) => {
     // The mood links the account could not resolve, by key, only when there
     // are any: "imported" alone told the person their tags had landed.
     ...droppedLinkKeysForWire(droppedLinkKeys),
+    // The account's own tags and groups the file names differently: kept as
+    // they are, and said so, only when there are any.
+    ...(keptMoodTagKeys.length > 0 ? { keptMoodTagKeys } : {}),
+    ...(keptMoodCategoryKeys.length > 0 ? { keptMoodCategoryKeys } : {}),
   };
 
   if (writeFailed) {
diff --git a/src/components/settings/import-panel/__tests__/json-import-result.test.tsx b/src/components/settings/import-panel/__tests__/json-import-result.test.tsx
index 64825e985..fe6fbfd03 100644
--- a/src/components/settings/import-panel/__tests__/json-import-result.test.tsx
+++ b/src/components/settings/import-panel/__tests__/json-import-result.test.tsx
@@ -38,9 +38,22 @@ describe("<JsonImportResultView>", () => {
     expect(html).toContain("Imported 3 measurements and 2 mood entries");
   });
 
+  it("names the account's own tags it kept rather than renamed", () => {
+    const html = render({
+      measurements: 0,
+      moodEntries: 2,
+      skipped: 0,
+      keptMoodTagKeys: ["custom:walk"],
+      keptMoodCategoryKeys: ["customcat:outdoors"],
+    });
+    expect(html).toContain('data-testid="import-json-kept-labels"');
+    expect(html).toContain("custom:walk, customcat:outdoors");
+  });
+
   it("says nothing about links when every one landed", () => {
     const html = render({ measurements: 3, moodEntries: 2, skipped: 0 });
     expect(html).not.toContain("import-json-dropped-links");
+    expect(html).not.toContain("import-json-kept-labels");
   });
 
   it("reads a missing count as none", () => {
@@ -49,6 +62,7 @@ describe("<JsonImportResultView>", () => {
       moodEntries: 0,
       skipped: 0,
       droppedLinkKeys: [],
+      keptLabelKeys: [],
     });
   });
 });
diff --git a/src/components/settings/import-panel/json-import-card.tsx b/src/components/settings/import-panel/json-import-card.tsx
index f64e6b7bc..e38c9b284 100644
--- a/src/components/settings/import-panel/json-import-card.tsx
+++ b/src/components/settings/import-panel/json-import-card.tsx
@@ -28,6 +28,11 @@ export interface JsonImportResult {
    * those links, which the count alone would not say.
    */
   droppedLinkKeys: string[];
+  /**
+   * Keys of the account's own tags and groups the file names differently.
+   * The account's names were kept, never overwritten.
+   */
+  keptLabelKeys: string[];
 }
 
 /** The route's `data`, read field by field; a missing count reads as none. */
@@ -38,6 +43,8 @@ export function readJsonImportResult(
     skipped?: number;
     droppedTagKeys?: string[];
     droppedFactorKeys?: string[];
+    keptMoodTagKeys?: string[];
+    keptMoodCategoryKeys?: string[];
   } | null,
 ): JsonImportResult {
   return {
@@ -48,6 +55,10 @@ export function readJsonImportResult(
       ...(data?.droppedTagKeys ?? []),
       ...(data?.droppedFactorKeys ?? []),
     ],
+    keptLabelKeys: [
+      ...(data?.keptMoodTagKeys ?? []),
+      ...(data?.keptMoodCategoryKeys ?? []),
+    ],
   };
 }
 
@@ -96,6 +107,16 @@ export function JsonImportResultView({ result }: { result: JsonImportResult }) {
           })}
         </p>
       )}
+      {result.keptLabelKeys.length > 0 && (
+        <p
+          className="text-muted-foreground text-xs"
+          data-testid="import-json-kept-labels"
+        >
+          {t("settings.sections.export.import.json.keptLabels", {
+            keys: result.keptLabelKeys.join(", "),
+          })}
+        </p>
+      )}
     </>
   );
 }
diff --git a/src/lib/import/json/mood.ts b/src/lib/import/json/mood.ts
index e706b6b62..76cd9fbae 100644
--- a/src/lib/import/json/mood.ts
+++ b/src/lib/import/json/mood.ts
@@ -8,8 +8,9 @@
  * ones.
  *
  * Each entry is written with its note, its level-A values, its zone, its day
- * context and its tag and factor links, in one transaction, the way the bulk
- * mood ingest writes one: a link that throws (a rating outside its factor's
+ * context and its tag and factor links (resolved through the account's
+ * vocabulary, `vocabulary.ts`), in one transaction, the way the bulk mood
+ * ingest writes one: a link that throws (a rating outside its factor's
  * own scale) takes the entry back with it, so a skipped row left nothing
  * behind.
  */
@@ -23,15 +24,12 @@ import { classifyExternalId } from "@/lib/validations/external-id";
 import { isP2002 } from "@/lib/prisma-errors";
 import { levelAForWrite } from "@/lib/mood/level-a";
 import { persistMoodContext } from "@/lib/mood/context";
-import {
-  RatedFactorOutOfRangeError,
-  replaceRatedFactorLinks,
-  replaceTagLinks,
-} from "@/lib/mood/tag-links";
+import { RatedFactorOutOfRangeError } from "@/lib/mood/tag-links";
 
 import { fallbackMoodDateStart } from "./mood-instant";
 import type { JsonImportMoodEntry } from "./schema";
 import type { JsonImportTally } from "./tally";
+import type { MoodLinkResolver } from "./vocabulary";
 
 export type { JsonImportMoodEntry } from "./schema";
 
@@ -98,32 +96,81 @@ interface DroppedKeys {
   factors: Set<string>;
 }
 
+/**
+ * Replace one kind of an entry's links with the ones the file states,
+ * resolved through the import's vocabulary. A link to an archived tag stays,
+ * as the edit path keeps it: it is history, not editable state. A rating
+ * outside its tag's own scale throws, and the transaction takes the entry
+ * back with it.
+ */
+async function replaceImportedLinks(
+  tx: Prisma.TransactionClient,
+  moodEntryId: string,
+  kind: "RATED" | "BINARY",
+  wanted: ReadonlyArray<{ key: string; rating: number | null }>,
+  resolver: MoodLinkResolver,
+  dropped: Set<string>,
+): Promise<void> {
+  const links = new Map<string, number | null>();
+  for (const { key, rating } of wanted) {
+    const tag = resolver.get(key);
+    if (!tag || tag.kind !== kind) {
+      dropped.add(key);
+      continue;
+    }
+    if (rating !== null && (rating < tag.scaleMin || rating > tag.scaleMax)) {
+      throw new RatedFactorOutOfRangeError(
+        key,
+        rating,
+        tag.scaleMin,
+        tag.scaleMax,
+      );
+    }
+    links.set(tag.id, rating);
+  }
+  await tx.moodEntryTagLink.deleteMany({
+    where: { moodEntryId, moodTag: { isActive: true, kind } },
+  });
+  if (links.size === 0) return;
+  await tx.moodEntryTagLink.createMany({
+    data: [...links].map(([moodTagId, rating]) => ({
+      moodEntryId,
+      moodTagId,
+      rating,
+    })),
+    skipDuplicates: true,
+  });
+}
+
 /** The entry's links and day context, when the file states them. */
 async function writeMoodEntryParts(
   tx: Prisma.TransactionClient,
   userId: string,
   moodEntryId: string,
   e: JsonImportMoodEntry,
+  resolver: MoodLinkResolver,
   dropped: DroppedKeys,
 ): Promise<void> {
   await persistMoodContext(tx, moodEntryId, userId, e.context);
   if (e.factors !== undefined) {
-    const keys = await replaceRatedFactorLinks(
-      moodEntryId,
-      userId,
-      e.factors,
+    await replaceImportedLinks(
       tx,
+      moodEntryId,
+      "RATED",
+      e.factors,
+      resolver,
+      dropped.factors,
     );
-    for (const key of keys) dropped.factors.add(key);
   }
   if (e.structuredTags !== undefined) {
-    const keys = await replaceTagLinks(
-      moodEntryId,
-      userId,
-      e.structuredTags,
+    await replaceImportedLinks(
       tx,
+      moodEntryId,
+      "BINARY",
+      e.structuredTags.map((key) => ({ key, rating: null })),
+      resolver,
+      dropped.tags,
     );
-    for (const key of keys) dropped.tags.add(key);
   }
 }
 
@@ -131,6 +178,7 @@ async function writeMoodEntry(
   userId: string,
   e: JsonImportMoodEntry,
   loggedAt: Date,
+  resolver: MoodLinkResolver,
   tally: JsonImportTally,
 ): Promise<void> {
   const columns = moodEntryColumns(e, loggedAt);
@@ -165,7 +213,7 @@ async function writeMoodEntry(
           data: { userId, ...columns, source: "IMPORT" },
           select: { id: true },
         });
-    await writeMoodEntryParts(tx, userId, row.id, e, dropped);
+    await writeMoodEntryParts(tx, userId, row.id, e, resolver, dropped);
   });
   for (const key of dropped.tags) tally.droppedTagKeys.add(key);
   for (const key of dropped.factors) tally.droppedFactorKeys.add(key);
@@ -209,6 +257,7 @@ async function importMoodEntry(
   userId: string,
   e: JsonImportMoodEntry,
   fallback: FallbackState,
+  resolver: MoodLinkResolver,
   tally: JsonImportTally,
 ): Promise<void> {
   // Same stability floor as the measurement rows: the mood upsert keys on
@@ -234,7 +283,7 @@ async function importMoodEntry(
       continue;
     }
     try {
-      await writeMoodEntry(userId, e, loggedAt, tally);
+      await writeMoodEntry(userId, e, loggedAt, resolver, tally);
       if (!e.loggedAt) {
         fallback.reserved.add(loggedAt.getTime());
       }
@@ -281,6 +330,7 @@ async function importMoodEntry(
 export async function importJsonMoodEntries(
   userId: string,
   rows: JsonImportMoodEntry[],
+  resolver: MoodLinkResolver,
   tally: JsonImportTally,
 ): Promise<void> {
   const fallback: FallbackState = {
@@ -288,7 +338,7 @@ export async function importJsonMoodEntries(
     reserved: new Set(),
   };
   for (const e of rows) {
-    await importMoodEntry(userId, e, fallback, tally);
+    await importMoodEntry(userId, e, fallback, resolver, tally);
     if (tally.writeFailed) break;
   }
 }
diff --git a/src/lib/import/json/normalize.ts b/src/lib/import/json/normalize.ts
index a4ee9403b..ec309675d 100644
--- a/src/lib/import/json/normalize.ts
+++ b/src/lib/import/json/normalize.ts
@@ -1,7 +1,7 @@
 /**
  * The JSON import reads what the app itself writes.
  *
- * Two of the app's files carry the import's two arrays: the full backup
+ * Two of the app's files carry the import's arrays: the full backup
  * (`/api/export/full-backup`), at the top level, and the JSON export
  * (`/api/export?format=json`), inside the response envelope's `data`. Neither
  * was written for the import schema, and both spell an absent value the way
@@ -104,5 +104,14 @@ export function normalizeJsonImportFile(
     file.moodEntries = read.entries;
     skipped += read.skipped;
   }
+  // The mood vocabulary the entries' links point into, read the same way.
+  for (const section of [
+    "customMoodTagCategories",
+    "customMoodTags",
+  ] as const) {
+    if (section in source) {
+      file[section] = readEntries(source[section], (entry) => entry).entries;
+    }
+  }
   return { file, skipped };
 }
diff --git a/src/lib/import/json/run.ts b/src/lib/import/json/run.ts
index 572b21cca..206b5b6de 100644
--- a/src/lib/import/json/run.ts
+++ b/src/lib/import/json/run.ts
@@ -18,16 +18,22 @@ import {
   type JsonImportMeasurement,
 } from "./measurements";
 import { importJsonMoodEntries, type JsonImportMoodEntry } from "./mood";
+import type { JsonImportMoodTag, JsonImportMoodTagCategory } from "./schema";
 import { newJsonImportTally, type JsonImportTally } from "./tally";
+import { resolveMoodVocabulary } from "./vocabulary";
 
 export async function runJsonImport(input: {
   userId: string;
   measurements: JsonImportMeasurement[] | undefined;
   moodEntries: JsonImportMoodEntry[] | undefined;
+  customMoodTagCategories: JsonImportMoodTagCategory[] | undefined;
+  customMoodTags: JsonImportMoodTag[] | undefined;
   ipAddress: string | null;
 }): Promise<
   Pick<JsonImportTally, "stats" | "writeFailed"> & {
     droppedLinkKeys: DroppedLinkKeys;
+    keptMoodTagKeys: string[];
+    keptMoodCategoryKeys: string[];
   }
 > {
   const { userId } = input;
@@ -49,8 +55,22 @@ export async function runJsonImport(input: {
       .map((row) => row.measuredAt),
   ).catch(() => {});
 
-  if (!tally.writeFailed && input.moodEntries?.length) {
-    await importJsonMoodEntries(userId, input.moodEntries, tally);
+  // The account's own vocabulary goes in before the entries that link to
+  // it, and every link key is resolved once.
+  const entries = input.moodEntries ?? [];
+  const resolver =
+    !tally.writeFailed &&
+    (entries.length > 0 || (input.customMoodTags?.length ?? 0) > 0)
+      ? await resolveMoodVocabulary({
+          userId,
+          entries,
+          categories: input.customMoodTagCategories ?? [],
+          tags: input.customMoodTags ?? [],
+          tally,
+        })
+      : new Map();
+  if (!tally.writeFailed && entries.length > 0) {
+    await importJsonMoodEntries(userId, entries, resolver, tally);
   }
 
   // One bounded re-fold per import is cheaper than firing N per-row hooks.
@@ -111,5 +131,7 @@ export async function runJsonImport(input: {
       droppedTagKeys: [...tally.droppedTagKeys].sort(),
       droppedFactorKeys: [...tally.droppedFactorKeys].sort(),
     },
+    keptMoodTagKeys: [...tally.keptMoodTagKeys].sort(),
+    keptMoodCategoryKeys: [...tally.keptMoodCategoryKeys].sort(),
   };
 }
diff --git a/src/lib/import/json/schema.ts b/src/lib/import/json/schema.ts
index 7b33bdd1a..89c3d728f 100644
--- a/src/lib/import/json/schema.ts
+++ b/src/lib/import/json/schema.ts
@@ -174,6 +174,44 @@ export const jsonImportMoodEntrySchema = z
     }
   });
 
+/**
+ * A mood-tag group the account made itself, as the full backup writes it.
+ * `id` is the file's own id, read only to find the group a tag of the file
+ * names; the group is matched and created by `key`.
+ */
+export const jsonImportMoodTagCategorySchema = z.object({
+  id: z.string().max(120).optional(),
+  key: z.string().min(1).max(80),
+  labelKey: z.string().min(1).max(120),
+  icon: z.string().max(60).optional(),
+  sortOrder: z.number().int().optional(),
+  isActive: z.boolean().optional(),
+  // The person's own name for the group: readable in a portable file,
+  // ciphertext in a disaster-recovery one (opened only by the host's keys).
+  label: z.string().max(200).optional(),
+  labelEncrypted: z.string().max(2000).optional(),
+});
+
+/**
+ * A mood tag the account made itself, a rated factor included. Matched and
+ * created by `key`; its group is the file's `categoryId`, resolved through
+ * the groups the file carries.
+ */
+export const jsonImportMoodTagSchema = z.object({
+  key: z.string().min(1).max(80),
+  labelKey: z.string().min(1).max(120),
+  categoryId: z.string().min(1).max(120),
+  kind: z.enum(["BINARY", "RATED"]),
+  isActive: z.boolean().optional(),
+  icon: z.string().max(60).optional(),
+  sortOrder: z.number().int().optional(),
+  label: z.string().max(200).optional(),
+  labelEncrypted: z.string().max(2000).optional(),
+  scaleMin: z.number().int().min(0).max(10).optional(),
+  scaleMax: z.number().int().min(0).max(10).optional(),
+  inverse: z.boolean().optional(),
+});
+
 export const jsonImportSchema = z.object({
   measurements: z
     .array(jsonImportMeasurementSchema)
@@ -183,7 +221,20 @@ export const jsonImportSchema = z.object({
     .array(jsonImportMoodEntrySchema)
     .max(JSON_IMPORT_MAX_ROWS)
     .optional(),
+  // The account's own mood vocabulary, which the entries' links point into.
+  customMoodTagCategories: z
+    .array(jsonImportMoodTagCategorySchema)
+    .max(JSON_IMPORT_MAX_ROWS)
+    .optional(),
+  customMoodTags: z
+    .array(jsonImportMoodTagSchema)
+    .max(JSON_IMPORT_MAX_ROWS)
+    .optional(),
 });
 
 export type JsonImportMeasurement = z.infer<typeof jsonImportMeasurementSchema>;
 export type JsonImportMoodEntry = z.infer<typeof jsonImportMoodEntrySchema>;
+export type JsonImportMoodTagCategory = z.infer<
+  typeof jsonImportMoodTagCategorySchema
+>;
+export type JsonImportMoodTag = z.infer<typeof jsonImportMoodTagSchema>;
diff --git a/src/lib/import/json/tally.ts b/src/lib/import/json/tally.ts
index 9110417a7..7627ad57b 100644
--- a/src/lib/import/json/tally.ts
+++ b/src/lib/import/json/tally.ts
@@ -11,6 +11,13 @@ export interface JsonImportTally {
    */
   droppedTagKeys: Set<string>;
   droppedFactorKeys: Set<string>;
+  /**
+   * The account's own tags and groups whose key the file shares and whose
+   * label it states differently. The account's version is kept, never
+   * overwritten; the key is named.
+   */
+  keptMoodTagKeys: Set<string>;
+  keptMoodCategoryKeys: Set<string>;
   /** A write failed for a reason other than a duplicate; the import stops. */
   writeFailed: boolean;
 }
@@ -21,6 +28,8 @@ export function newJsonImportTally(): JsonImportTally {
     unstableShapes: [],
     droppedTagKeys: new Set(),
     droppedFactorKeys: new Set(),
+    keptMoodTagKeys: new Set(),
+    keptMoodCategoryKeys: new Set(),
     writeFailed: false,
   };
 }
diff --git a/src/lib/import/json/vocabulary.ts b/src/lib/import/json/vocabulary.ts
new file mode 100644
index 000000000..761c1ef69
--- /dev/null
+++ b/src/lib/import/json/vocabulary.ts
@@ -0,0 +1,288 @@
+/**
+ * The account's own mood vocabulary, brought along by a JSON import.
+ *
+ * A mood entry links to tags by key: the seeded catalogue's, and the ones the
+ * person made (custom tags, their own rated factors, the groups they sit in).
+ * A full backup carries the account's own as `customMoodTags` and
+ * `customMoodTagCategories`. Without them an entry imported into another
+ * account landed without every link to a tag the person had made.
+ *
+ * So before the entries are written, each key an entry or the file names is
+ * resolved once, to the tag the importing account links to:
+ *
+ *   - a catalogue tag, or a tag the account already owns, is used as it is.
+ *     An own tag whose label differs from the file's is kept, never
+ *     overwritten, and named (`keptMoodTagKeys`): the account's name for it
+ *     is the one it uses now;
+ *   - a tag the file defines and the account lacks is created, under its own
+ *     key, in its group (created the same way when missing);
+ *   - a key another account on this instance holds (keys are unique per
+ *     instance, so a file moved between two accounts of one server collides)
+ *     comes over under a key derived from the account and the file's key, so
+ *     importing the same file twice finds the copy rather than making a
+ *     second one;
+ *   - anything else (a key neither the catalogue nor the file knows, the
+ *     wrong kind for its link, a tag past the account's custom-tag cap) is
+ *     dropped from the entries and named.
+ */
+import { createHash } from "node:crypto";
+
+import type { Prisma } from "@/generated/prisma/client";
+import { prisma } from "@/lib/db";
+import { sealForRestore } from "@/lib/export/sealed-text";
+import {
+  CUSTOM_CATEGORY_KEY_PREFIX,
+  CUSTOM_TAG_KEY_PREFIX,
+  decryptCustomLabel,
+  MAX_CUSTOM_GROUPS_PER_USER,
+  MAX_CUSTOM_TAGS_PER_USER,
+} from "@/lib/mood/custom-tags";
+
+import type {
+  JsonImportMoodEntry,
+  JsonImportMoodTag,
+  JsonImportMoodTagCategory,
+} from "./schema";
+import type { JsonImportTally } from "./tally";
+
+/** A tag an imported link may point at. */
+export interface ImportLinkTag {
+  id: string;
+  kind: string;
+  scaleMin: number;
+  scaleMax: number;
+}
+
+/** The file's keys, resolved to the importing account's tags. */
+export type MoodLinkResolver = ReadonlyMap<string, ImportLinkTag>;
+
+/** The seeded group a tag lands in when the file does not carry its own. */
+const FALLBACK_CATEGORY_KEY = "custom";
+
+const LINK_TAG_SELECT = {
+  id: true,
+  key: true,
+  kind: true,
+  scaleMin: true,
+  scaleMax: true,
+  userId: true,
+  labelEncrypted: true,
+} as const satisfies Prisma.MoodTagSelect;
+
+/**
+ * The key a copy of `fileKey` carries in `userId`'s account when another
+ * account holds `fileKey`: a fresh-looking custom key, the same on every
+ * import of the same file into the same account.
+ */
+export function derivedVocabularyKey(
+  prefix: string,
+  userId: string,
+  fileKey: string,
+): string {
+  const hex = createHash("sha256")
+    .update(`${userId}\u0000${fileKey}`)
+    .digest("hex");
+  return `${prefix}${hex.slice(0, 8)}-${hex.slice(8, 12)}-${hex.slice(12, 16)}-${hex.slice(16, 20)}-${hex.slice(20, 32)}`;
+}
+
+/** The file's readable label, or the one its ciphertext opens to here. */
+function fileLabel(item: {
+  label?: string;
+  labelEncrypted?: string;
+}): string | null {
+  if (item.label !== undefined) return item.label;
+  return item.labelEncrypted ? decryptCustomLabel(item.labelEncrypted) : null;
+}
+
+/** The label column for a row written from `item`, sealed under this host's key. */
+function sealedLabel(
+  item: { label?: string; labelEncrypted?: string },
+  path: string,
+): string | null {
+  return sealForRestore(item.labelEncrypted, item.label, path, []);
+}
+
+class Vocabulary {
+  private readonly categoryIds = new Map<string, string | null>();
+  private ownTags = 0;
+  private ownGroups = 0;
+
+  constructor(
+    private readonly userId: string,
+    private readonly categories: readonly JsonImportMoodTagCategory[],
+    private readonly tally: JsonImportTally,
+  ) {}
+
+  async countOwn(): Promise<void> {
+    [this.ownTags, this.ownGroups] = await Promise.all([
+      prisma.moodTag.count({ where: { userId: this.userId, isActive: true } }),
+      prisma.moodTagCategory.count({ where: { userId: this.userId } }),
+    ]);
+  }
+
+  /** The importing account's group for a tag of the file, or null. */
+  async category(fileCategoryId: string): Promise<string | null> {
+    const cached = this.categoryIds.get(fileCategoryId);
+    if (cached !== undefined) return cached;
+    const resolved = await this.resolveCategory(fileCategoryId);
+    this.categoryIds.set(fileCategoryId, resolved);
+    return resolved;
+  }
+
+  private async resolveCategory(
+    fileCategoryId: string,
+  ): Promise<string | null> {
+    const own = this.categories.find((c) => c.id === fileCategoryId);
+    if (!own) {
+      // A seeded group of the instance the file came from. Its id is this
+      // instance's only when the file came from here; otherwise the tag goes
+      // to the seeded group made for custom tags.
+      const seeded =
+        (await prisma.moodTagCategory.findFirst({
+          where: { userId: null, id: fileCategoryId },
+          select: { id: true },
+        })) ??
+        (await prisma.moodTagCategory.findFirst({
+          where: { userId: null, key: FALLBACK_CATEGORY_KEY },
+          select: { id: true },
+        }));
+      return seeded?.id ?? null;
+    }
+    const existing = await prisma.moodTagCategory.findUnique({
+      where: { key: own.key },
+      select: { id: true, userId: true, labelEncrypted: true },
+    });
+    if (
+      existing &&
+      (existing.userId === null || existing.userId === this.userId)
+    ) {
+      const label = fileLabel(own);
+      if (
+        existing.userId === this.userId &&
+        label !== null &&
+        decryptCustomLabel(existing.labelEncrypted) !== label
+      ) {
+        this.tally.keptMoodCategoryKeys.add(own.key);
+      }
+      return existing.id;
+    }
+    const key = existing
+      ? derivedVocabularyKey(CUSTOM_CATEGORY_KEY_PREFIX, this.userId, own.key)
+      : own.key;
+    const copy = await prisma.moodTagCategory.findUnique({
+      where: { key },
+      select: { id: true, userId: true },
+    });
+    if (copy) return copy.userId === this.userId ? copy.id : null;
+    if (this.ownGroups >= MAX_CUSTOM_GROUPS_PER_USER) return null;
+    const created = await prisma.moodTagCategory.create({
+      data: {
+        userId: this.userId,
+        key,
+        labelKey: own.labelKey,
+        icon: own.icon ?? null,
+        sortOrder: own.sortOrder ?? 0,
+        isActive: own.isActive ?? true,
+        labelEncrypted: sealedLabel(own, `customMoodTagCategories.${own.key}`),
+      },
+      select: { id: true },
+    });
+    this.ownGroups += 1;
+    return created.id;
+  }
+
+  /** Create `tag` in the importing account under `key`; null when it cannot be. */
+  async create(
+    tag: JsonImportMoodTag,
+    key: string,
+  ): Promise<ImportLinkTag | null> {
+    const active = tag.isActive ?? true;
+    if (active && this.ownTags >= MAX_CUSTOM_TAGS_PER_USER) return null;
+    const categoryId = await this.category(tag.categoryId);
+    if (categoryId === null) return null;
+    const created = await prisma.moodTag.create({
+      data: {
+        userId: this.userId,
+        key,
+        labelKey: tag.labelKey,
+        categoryId,
+        kind: tag.kind,
+        isActive: active,
+        icon: tag.icon ?? null,
+        sortOrder: tag.sortOrder ?? 0,
+        labelEncrypted: sealedLabel(tag, `customMoodTags.${tag.key}`),
+        scaleMin: tag.scaleMin ?? 1,
+        scaleMax: tag.scaleMax ?? 5,
+        inverse: tag.inverse ?? false,
+      },
+      select: LINK_TAG_SELECT,
+    });
+    if (active) this.ownTags += 1;
+    return created;
+  }
+}
+
+/**
+ * Resolve every key the file's entries link to, creating the account's own
+ * tags and groups the file brings and the account lacks. Keys that resolve
+ * to nothing are named on the tally by the link writer, which knows which
+ * kind of link asked for them.
+ */
+export async function resolveMoodVocabulary(input: {
+  userId: string;
+  entries: readonly JsonImportMoodEntry[];
+  categories: readonly JsonImportMoodTagCategory[];
+  tags: readonly JsonImportMoodTag[];
+  tally: JsonImportTally;
+}): Promise<MoodLinkResolver> {
+  const { userId, entries, tally } = input;
+  const definitions = new Map(input.tags.map((tag) => [tag.key, tag]));
+  const keys = new Set<string>(definitions.keys());
+  for (const entry of entries) {
+    for (const factor of entry.factors ?? []) keys.add(factor.key);
+    for (const key of entry.structuredTags ?? []) keys.add(key);
+  }
+  const resolved = new Map<string, ImportLinkTag>();
+  if (keys.size === 0) return resolved;
+
+  const derived = new Map(
+    [...definitions.keys()].map((key) => [
+      key,
+      derivedVocabularyKey(CUSTOM_TAG_KEY_PREFIX, userId, key),
+    ]),
+  );
+  const rows = await prisma.moodTag.findMany({
+    where: { key: { in: [...keys, ...derived.values()] } },
+    select: LINK_TAG_SELECT,
+  });
+  const byKey = new Map(rows.map((row) => [row.key, row]));
+  const vocabulary = new Vocabulary(userId, input.categories, tally);
+  await vocabulary.countOwn();
+
+  for (const key of keys) {
+    const definition = definitions.get(key);
+    const row = byKey.get(key);
+    if (row && (row.userId === null || row.userId === userId)) {
+      const label = definition ? fileLabel(definition) : null;
+      if (
+        row.userId === userId &&
+        label !== null &&
+        decryptCustomLabel(row.labelEncrypted) !== label
+      ) {
+        tally.keptMoodTagKeys.add(key);
+      }
+      resolved.set(key, row);
+      continue;
+    }
+    if (!definition) continue;
+    const target = row ? derived.get(key)! : key;
+    const copy = row ? byKey.get(target) : undefined;
+    if (copy) {
+      if (copy.userId === userId) resolved.set(key, copy);
+      continue;
+    }
+    const created = await vocabulary.create(definition, target);
+    if (created) resolved.set(key, created);
+  }
+  return resolved;
+}
diff --git a/src/lib/openapi/routes/import.ts b/src/lib/openapi/routes/import.ts
index 871fa2d04..c22baff64 100644
--- a/src/lib/openapi/routes/import.ts
+++ b/src/lib/openapi/routes/import.ts
@@ -228,14 +228,14 @@ const jsonImportMoodEntry = z
       .max(30)
       .optional()
       .describe(
-        "Rated factors by catalogue key; replaces the entry's rated links. A key the account cannot resolve is dropped and named in `droppedFactorKeys`; a rating outside the factor's own scale skips the entry.",
+        "Rated factors by key (the catalogue's, or the account's own as for `structuredTags`); replaces the entry's rated links. A key the account cannot resolve is dropped and named in `droppedFactorKeys`; a rating outside the factor's own scale skips the entry.",
       ),
     structuredTags: z
       .array(z.string().max(60))
       .max(30)
       .optional()
       .describe(
-        "Ticked tags by key (the catalogue or the account's own); replaces the entry's tag links. An unresolvable key is dropped and named in `droppedTagKeys`.",
+        "Ticked tags by key (the catalogue, the account's own, or one the file's `customMoodTags` brings); replaces the entry's tag links. An unresolvable key is dropped and named in `droppedTagKeys`.",
       ),
     context: moodContextWire
       .partial()
@@ -257,15 +257,82 @@ const jsonImportMoodEntry = z
     description: "One mood-entry row of a JSON import file.",
   });
 
+const jsonImportMoodTagCategory = z
+  .object({
+    id: z
+      .string()
+      .max(120)
+      .optional()
+      .describe(
+        "The file's own id, read only to find the group a tag names in `categoryId`.",
+      ),
+    key: z.string().min(1).max(80),
+    labelKey: z.string().min(1).max(120),
+    icon: z.string().max(60).optional(),
+    sortOrder: z.number().int().optional(),
+    isActive: z.boolean().optional(),
+    label: z.string().max(200).optional().describe("The group's own name."),
+    labelEncrypted: z
+      .string()
+      .max(2000)
+      .optional()
+      .describe(
+        "A disaster-recovery file's sealed name, used only when this server's keys open it.",
+      ),
+  })
+  .meta({
+    id: "JsonImportMoodTagCategory",
+    description:
+      "A mood-tag group the account made itself. Matched by `key`: a group the account has is used as it is, a missing one is created.",
+  });
+
+const jsonImportMoodTag = z
+  .object({
+    key: z.string().min(1).max(80),
+    labelKey: z.string().min(1).max(120),
+    categoryId: z
+      .string()
+      .min(1)
+      .max(120)
+      .describe(
+        "The group's id in the file; a group the file does not carry falls back to the seeded `custom` group.",
+      ),
+    kind: z.enum(["BINARY", "RATED"]),
+    isActive: z.boolean().optional(),
+    icon: z.string().max(60).optional(),
+    sortOrder: z.number().int().optional(),
+    label: z.string().max(200).optional().describe("The tag's own name."),
+    labelEncrypted: z
+      .string()
+      .max(2000)
+      .optional()
+      .describe(
+        "A disaster-recovery file's sealed name, used only when this server's keys open it.",
+      ),
+    scaleMin: z.number().int().min(0).max(10).optional(),
+    scaleMax: z.number().int().min(0).max(10).optional(),
+    inverse: z.boolean().optional(),
+  })
+  .meta({
+    id: "JsonImportMoodTag",
+    description:
+      "A mood tag the account made itself, a rated factor included. Matched by `key`: the account's own tag of that key is used and never overwritten (a different label is named in `keptMoodTagKeys`); a missing one is created, within the account's custom-tag cap; a key another account of this server holds comes over under a key derived from the account and the file's key, so a second import of the same file finds it.",
+  });
+
 const jsonImportRequest = z
   .object({
     measurements: z.array(jsonImportMeasurement).max(10000).optional(),
     moodEntries: z.array(jsonImportMoodEntry).max(10000).optional(),
+    customMoodTagCategories: z
+      .array(jsonImportMoodTagCategory)
+      .max(10000)
+      .optional(),
+    customMoodTags: z.array(jsonImportMoodTag).max(10000).optional(),
   })
   .meta({
     id: "JsonImportRequest",
     description:
-      "JSON import payload: the measurements and mood entries of the JSON export or the portable full backup. Both sections optional; up to 10 000 rows each.",
+      "JSON import payload: the measurements and mood entries of the JSON export or the portable full backup, and the backup's own mood vocabulary the entries link to. Every section optional; up to 10 000 rows each.",
   });
 
 const jsonImportStats = z
@@ -299,6 +366,16 @@ const jsonImportStats = z
       .describe(
         "Rated-factor keys this account cannot resolve, as `droppedTagKeys`.",
       ),
+    keptMoodTagKeys: z
+      .array(z.string())
+      .optional()
+      .describe(
+        "Keys of the account's own tags the file names differently. The account's tag is kept as it is. Present only when non-empty.",
+      ),
+    keptMoodCategoryKeys: z
+      .array(z.string())
+      .optional()
+      .describe("The same, for the account's own tag groups."),
   })
   .meta({
     id: "JsonImportStats",
diff --git a/tests/integration/json-import-field-coverage.test.ts b/tests/integration/json-import-field-coverage.test.ts
index 69bcf01fb..c0aa14789 100644
--- a/tests/integration/json-import-field-coverage.test.ts
+++ b/tests/integration/json-import-field-coverage.test.ts
@@ -28,6 +28,8 @@ import {
   jsonImportMeasurementSchema,
   jsonImportMoodContextSchema,
   jsonImportMoodEntrySchema,
+  jsonImportMoodTagCategorySchema,
+  jsonImportMoodTagSchema,
 } from "@/lib/import/json/schema";
 
 import { callRoute } from "../kit/call-route";
@@ -86,20 +88,26 @@ const CONTEXT_NOT_IMPORTED: Record<string, string> = {
   updatedAt: ROW_STAMP,
 };
 
+/** A tag or group of the file is matched and created by key, not by id. */
+const MOOD_TAG_NOT_IMPORTED: Record<string, string> = {
+  id: "A tag is matched and created by its key; its id in the file names a row of the account it came from (disaster-recovery file only).",
+};
+const MOOD_CATEGORY_NOT_IMPORTED: Record<string, string> = {};
+
 /**
- * The files' other sections. The JSON import carries readings and mood
- * entries into an account that has its own record already; an account's
- * whole record (medications, labs, documents, settings, …) comes back through
- * the backup restore, which replaces it. The mood vocabulary is named apart
- * because the entries' links point into it: a link to a tag the importing
- * account does not have is dropped and named in the response.
+ * The files' other sections. The JSON import carries readings, mood entries
+ * and the account's own mood vocabulary (which the entries' links point into)
+ * into an account that has its own record already; an account's whole record
+ * (medications, labs, documents, settings, …) comes back through the backup
+ * restore, which replaces it.
  */
-const IMPORTED_SECTIONS = new Set(["measurements", "moodEntries"]);
-const VOCABULARY_SECTIONS: Record<string, string> = {
-  customMoodTags:
-    "Account vocabulary, restored by the backup restore. An imported link to one of these tags resolves only when the importing account has a tag of that key, and is otherwise dropped and named (`droppedTagKeys`).",
-  customMoodTagCategories:
-    "Account vocabulary, restored by the backup restore with the tags it groups.",
+const IMPORTED_SECTIONS = new Set([
+  "measurements",
+  "moodEntries",
+  "customMoodTags",
+  "customMoodTagCategories",
+]);
+const NAMED_MOOD_SECTIONS: Record<string, string> = {
   hiddenMoodTags:
     "An account setting (which tags its editor hides), restored by the backup restore.",
 };
@@ -166,6 +174,18 @@ const MEASUREMENT_READ = new Set(
 );
 const MOOD_READ = new Set(Object.keys(jsonImportMoodEntrySchema.shape));
 const CONTEXT_READ = new Set(Object.keys(jsonImportMoodContextSchema.shape));
+const MOOD_TAG_READ = new Set(Object.keys(jsonImportMoodTagSchema.shape));
+const MOOD_CATEGORY_READ = new Set(
+  Object.keys(jsonImportMoodTagCategorySchema.shape),
+);
+const BACKUP_NAMES = ["portable", "disasterRecovery"] as const;
+
+function sectionOf(
+  name: (typeof BACKUP_NAMES)[number],
+  section: "customMoodTags" | "customMoodTagCategories",
+): Row[] {
+  return files[name][section] as Row[];
+}
 
 const FILE_NAMES = ["jsonExport", "portable", "disasterRecovery"] as const;
 
@@ -207,13 +227,37 @@ describe("the JSON import reads what the exporters write", () => {
     },
   );
 
-  it("names the mood vocabulary the entries' links point into", () => {
-    for (const name of ["portable", "disasterRecovery"] as const) {
+  it.each(BACKUP_NAMES)("every field of the %s's own mood tags", (name) => {
+    const rows = sectionOf(name, "customMoodTags");
+    // The seed's own tag and its own rated factor.
+    expect(rows.length).toBeGreaterThanOrEqual(2);
+    expect(
+      unaccounted(keysOf(rows), MOOD_TAG_READ, MOOD_TAG_NOT_IMPORTED),
+    ).toEqual([]);
+  });
+
+  it.each(BACKUP_NAMES)("every field of the %s's own mood groups", (name) => {
+    const rows = sectionOf(name, "customMoodTagCategories");
+    expect(rows.length).toBeGreaterThan(0);
+    expect(
+      unaccounted(keysOf(rows), MOOD_CATEGORY_READ, MOOD_CATEGORY_NOT_IMPORTED),
+    ).toEqual([]);
+  });
+
+  it("reads or names every mood section the backups carry", () => {
+    for (const name of BACKUP_NAMES) {
       const sections = Object.keys(files[name]);
       expect(sections).toEqual(expect.arrayContaining([...IMPORTED_SECTIONS]));
-      for (const section of Object.keys(VOCABULARY_SECTIONS)) {
+      for (const section of Object.keys(NAMED_MOOD_SECTIONS)) {
         expect(sections, `${name} carries ${section}`).toContain(section);
       }
+      // Every mood section of the file is one of the two lists.
+      const mood = sections.filter((s) => /mood/i.test(s));
+      expect(
+        mood.filter(
+          (s) => !IMPORTED_SECTIONS.has(s) && !(s in NAMED_MOOD_SECTIONS),
+        ),
+      ).toEqual([]);
     }
     // The JSON export's other two sections are medications, restored the
     // same way as every other section of an account's record.
@@ -245,6 +289,14 @@ describe("the JSON import reads what the exporters write", () => {
       ...Object.keys(CONTEXT_NOT_IMPORTED)
         .filter((key) => !writtenContext.has(key))
         .map((key) => `context.${key}`),
+      ...Object.keys(MOOD_TAG_NOT_IMPORTED)
+        .filter(
+          (key) =>
+            !BACKUP_NAMES.some((name) =>
+              keysOf(sectionOf(name, "customMoodTags")).has(key),
+            ),
+        )
+        .map((key) => `customMoodTag.${key}`),
     ];
     expect(stale).toEqual([]);
   });
@@ -256,6 +308,7 @@ describe("the JSON import reads what the exporters write", () => {
       ),
       ...Object.keys(MOOD_NOT_IMPORTED).filter((k) => MOOD_READ.has(k)),
       ...Object.keys(CONTEXT_NOT_IMPORTED).filter((k) => CONTEXT_READ.has(k)),
+      ...Object.keys(MOOD_TAG_NOT_IMPORTED).filter((k) => MOOD_TAG_READ.has(k)),
     ];
     expect(both).toEqual([]);
   });
diff --git a/tests/integration/json-import-own-exports.test.ts b/tests/integration/json-import-own-exports.test.ts
index 50487557f..29540ce28 100644
--- a/tests/integration/json-import-own-exports.test.ts
+++ b/tests/integration/json-import-own-exports.test.ts
@@ -29,11 +29,14 @@ import { POST as importJson } from "@/app/api/import/route";
 import { encryptNote, readNote } from "@/lib/crypto/note-cipher";
 import { buildFullBackupPayload } from "@/lib/export/full-backup-payload";
 import { streamFullBackupJson } from "@/lib/export/full-backup-stream";
+import { derivedVocabularyKey } from "@/lib/import/json/vocabulary";
+import { decryptCustomLabel, encryptCustomLabel } from "@/lib/mood/custom-tags";
 
 import { callRoute } from "../kit/call-route";
 import { makeSession, makeUser } from "../kit/factories";
 import {
   JI_OWN_TAG_KEY,
+  JI_OWN_TAG_LABEL,
   seedJsonImportCatalogue,
   seedJsonImportOwner,
 } from "./json-import-seed";
@@ -49,14 +52,19 @@ interface ImportStats {
   skipped: number;
   droppedTagKeys?: string[];
   droppedFactorKeys?: string[];
+  keptMoodTagKeys?: string[];
 }
 
 let ownerId: string;
 
-async function fullBackupOf(userId: string): Promise<{
+interface FullBackup {
   measurements: Row[];
   moodEntries: Row[];
-}> {
+  customMoodTags: Row[];
+  customMoodTagCategories: Row[];
+}
+
+async function fullBackupOf(userId: string): Promise<FullBackup> {
   let text = "";
   await streamFullBackupJson(prisma, userId, (chunk) => {
     text += chunk;
@@ -89,6 +97,35 @@ async function importInto(file: unknown) {
   return { userId: user.id, res };
 }
 
+/**
+ * A file's own vocabulary, comparable across accounts and servers: each tag
+ * with its group named by key rather than by a row id.
+ */
+function vocabularyOf(file: FullBackup) {
+  const groupKey = new Map(
+    file.customMoodTagCategories.map((c) => [c.id as string, c.key as string]),
+  );
+  const groups = new Map(
+    file.customMoodTagCategories.map((c) => {
+      const { id: _id, ...rest } = c;
+      return [c.key as string, rest];
+    }),
+  );
+  return file.customMoodTags
+    .map((tag) => {
+      const { categoryId, ...rest } = tag;
+      const categoryKey =
+        groupKey.get(categoryId as string) ?? (categoryId as string);
+      return {
+        ...rest,
+        key: tag.key as string,
+        categoryKey,
+        group: groups.get(categoryKey) ?? null,
+      };
+    })
+    .sort((a, b) => String(a.key).localeCompare(String(b.key)));
+}
+
 /** A row without the fields the import deliberately does not carry. */
 function comparable(row: Row): Row {
   const { id: _id, source: _source, ...rest } = row;
@@ -112,7 +149,7 @@ afterAll(async () => {
 });
 
 describe("the JSON import takes the app's own files back", () => {
-  it("takes a full backup back field for field", async () => {
+  it("takes a full backup into another account of the same server, every link included", async () => {
     const original = await fullBackupOf(ownerId);
     // The file carries the shapes the import used to refuse or drop.
     expect(original.measurements.some((m) => m.notes === null)).toBe(true);
@@ -123,33 +160,100 @@ describe("the JSON import takes the app's own files back", () => {
 
     const { userId, res } = await importInto(original);
     expect(res.status).toBe(200);
+    // Every link lands: the owner's own tags come over as copies, under keys
+    // of the importing account, because this server's keys are the owner's.
     expect(res.data).toEqual({
       measurements: original.measurements.length,
       moodEntries: original.moodEntries.length,
       skipped: 0,
-      // The account's own tag is not this account's: the entry lands without
-      // that one link, and the response says which.
-      droppedTagKeys: [JI_OWN_TAG_KEY],
     });
+    const copyOf = (key: string) =>
+      key.startsWith("custom:")
+        ? derivedVocabularyKey("custom:", userId, key)
+        : key.startsWith("customcat:")
+          ? derivedVocabularyKey("customcat:", userId, key)
+          : key;
 
     const back = await fullBackupOf(userId);
-    const expectedMeasurements = original.measurements
-      .map(comparable)
-      .sort(byInstant("measuredAt"));
     expect(
       back.measurements.map(comparable).sort(byInstant("measuredAt")),
-    ).toEqual(expectedMeasurements);
+    ).toEqual(
+      original.measurements.map(comparable).sort(byInstant("measuredAt")),
+    );
     const expectedMood = original.moodEntries
       .map((entry) => ({
         ...comparable(entry),
-        structuredTags: (entry.structuredTags as string[]).filter(
-          (key) => key !== JI_OWN_TAG_KEY,
+        structuredTags: (entry.structuredTags as string[]).map(copyOf),
+        factors: (entry.factors as Array<{ key: string; rating: number }>).map(
+          (factor) => ({ ...factor, key: copyOf(factor.key) }),
         ),
       }))
       .sort(byInstant("loggedAt"));
     expect(
       back.moodEntries.map(comparable).sort(byInstant("loggedAt")),
     ).toEqual(expectedMood);
+    expect(vocabularyOf(back)).toEqual(
+      vocabularyOf(original)
+        .map((tag) => ({
+          ...tag,
+          key: copyOf(tag.key),
+          categoryKey: copyOf(tag.categoryKey),
+          group: tag.group && {
+            ...tag.group,
+            key: copyOf(String(tag.group.key)),
+          },
+        }))
+        .sort((a, b) => a.key.localeCompare(b.key)),
+    );
+
+    // A second import of the same file finds the copies.
+    const user = await prisma.user.findUniqueOrThrow({ where: { id: userId } });
+    const again = await callRoute<ImportStats>(importJson, {
+      method: "POST",
+      route: "/api/import",
+      body: original,
+      auth: await makeSession(user),
+    });
+    expect(again.status).toBe(200);
+    expect(await prisma.moodTag.count({ where: { userId } })).toBe(
+      original.customMoodTags.length,
+    );
+    expect(await prisma.moodTagCategory.count({ where: { userId } })).toBe(
+      original.customMoodTagCategories.length,
+    );
+  });
+
+  it("keeps the account's own name for a tag the file names differently, and says so", async () => {
+    const original = await fullBackupOf(ownerId);
+    // The owner renames the tag after the backup, then imports the backup.
+    await prisma.moodTag.update({
+      where: { key: JI_OWN_TAG_KEY },
+      data: { labelEncrypted: encryptCustomLabel("Evening walk") },
+    });
+    const owner = await prisma.user.findUniqueOrThrow({
+      where: { id: ownerId },
+    });
+    // The vocabulary alone: the readings of a portable file carry no source
+    // id, and would be written a second time into the account they came from.
+    const res = await callRoute<ImportStats>(importJson, {
+      method: "POST",
+      route: "/api/import",
+      body: {
+        customMoodTags: original.customMoodTags,
+        customMoodTagCategories: original.customMoodTagCategories,
+      },
+      auth: await makeSession(owner),
+    });
+    expect(res.status).toBe(200);
+    expect(res.data.keptMoodTagKeys).toEqual([JI_OWN_TAG_KEY]);
+    const tag = await prisma.moodTag.findUniqueOrThrow({
+      where: { key: JI_OWN_TAG_KEY },
+    });
+    expect(decryptCustomLabel(tag.labelEncrypted)).toBe("Evening walk");
+    await prisma.moodTag.update({
+      where: { key: JI_OWN_TAG_KEY },
+      data: { labelEncrypted: encryptCustomLabel(JI_OWN_TAG_LABEL) },
+    });
   });
 
   it("takes the JSON export back, empty strings and its envelope included", async () => {
@@ -245,6 +349,40 @@ describe("the JSON import takes the app's own files back", () => {
   });
 });
 
+describe("a full backup moved to another server", () => {
+  it("comes back equal, the account's own tags, groups and rated factor included", async () => {
+    const original = await fullBackupOf(ownerId);
+    expect(original.customMoodTags.length).toBeGreaterThanOrEqual(2);
+    expect(original.customMoodTags.some((tag) => tag.kind === "RATED")).toBe(
+      true,
+    );
+    expect(original.customMoodTagCategories).toHaveLength(1);
+
+    // Another server: the same seeded catalogue, none of this account's rows.
+    await truncateAllTables(prisma);
+    await seedJsonImportCatalogue(prisma);
+
+    const { userId, res } = await importInto(original);
+    expect(res.status).toBe(200);
+    expect(res.data).toEqual({
+      measurements: original.measurements.length,
+      moodEntries: original.moodEntries.length,
+      skipped: 0,
+    });
+
+    const back = await fullBackupOf(userId);
+    expect(
+      back.measurements.map(comparable).sort(byInstant("measuredAt")),
+    ).toEqual(
+      original.measurements.map(comparable).sort(byInstant("measuredAt")),
+    );
+    expect(
+      back.moodEntries.map(comparable).sort(byInstant("loggedAt")),
+    ).toEqual(original.moodEntries.map(comparable).sort(byInstant("loggedAt")));
+    expect(vocabularyOf(back)).toEqual(vocabularyOf(original));
+  });
+});
+
 describe("the CSV import reads the measurement CSV export", () => {
   const READINGS = [
     { type: "WEIGHT", value: 81.4, unit: "kg", at: "2026-09-10T06:30:00.000Z" },
diff --git a/tests/integration/json-import-seed.ts b/tests/integration/json-import-seed.ts
index 5191d1b0c..c613c3114 100644
--- a/tests/integration/json-import-seed.ts
+++ b/tests/integration/json-import-seed.ts
@@ -5,21 +5,27 @@
  * Every reading carries what makes it that reading: a range keeps its bounds,
  * a sleep night its stages and its writer, a rhythm alert its verdict, a
  * glucose value its meal-time context, a note its text. The mood entry
- * carries a note, all five level-A values, its zone, a rated factor, a
- * catalogue tag, a tag of the account's own and a full day context. A field
+ * carries a note, all five level-A values, its zone, a catalogue factor and
+ * tag, the account's own tag and its own rated factor (in a group of its own)
+ * and a full day context. A field
  * the seed leaves empty is a field neither test can see arrive, so nothing
  * here is left at its default.
  */
 import type { PrismaClient } from "@/generated/prisma/client";
 import { encryptNote } from "@/lib/crypto/note-cipher";
 import { encodeKeyList } from "@/lib/mood/context-vocabulary";
+import { encryptCustomLabel } from "@/lib/mood/custom-tags";
 
 import { makeUser } from "../kit/factories";
 
 export const JI_FACTOR_KEY = "ji_sleep_quality";
 export const JI_TAG_KEY = "ji_headache";
-/** The account's own tag: another account importing the file cannot resolve it. */
+/** The account's own tag, in a seeded group. */
 export const JI_OWN_TAG_KEY = "custom:ji_long_walk";
+/** The account's own group, and its own rated factor in it. */
+export const JI_OWN_CATEGORY_KEY = "customcat:ji_outdoors";
+export const JI_OWN_FACTOR_KEY = "custom:ji_trail_feel";
+export const JI_OWN_TAG_LABEL = "Long walk";
 
 export const JI_MEASUREMENTS = [
   {
@@ -119,11 +125,19 @@ export interface SeededOwner {
 export async function seedJsonImportCatalogue(
   prisma: PrismaClient,
 ): Promise<void> {
+  // Fixed ids, as the migrations seed the real catalogue (whose `custom`
+  // group the test database holds too): a group's id is the same on every
+  // server, which is what lets an imported tag find it.
   const category = await prisma.moodTagCategory.create({
-    data: { key: "ji_category", labelKey: "mood.tagCategory.ji" },
+    data: {
+      id: "mtc_ji_category",
+      key: "ji_category",
+      labelKey: "mood.tagCategory.ji",
+    },
   });
   await prisma.moodTag.create({
     data: {
+      id: "mt_ji_headache",
       categoryId: category.id,
       key: JI_TAG_KEY,
       labelKey: "mood.tag.jiHeadache",
@@ -132,6 +146,7 @@ export async function seedJsonImportCatalogue(
   });
   await prisma.moodTag.create({
     data: {
+      id: "mt_ji_sleep_quality",
       categoryId: category.id,
       key: JI_FACTOR_KEY,
       labelKey: "mood.tag.jiSleepQuality",
@@ -195,6 +210,31 @@ export async function seedJsonImportOwner(
       key: JI_OWN_TAG_KEY,
       labelKey: "mood.tag.custom",
       kind: "BINARY",
+      labelEncrypted: encryptCustomLabel(JI_OWN_TAG_LABEL),
+    },
+  });
+  const ownCategory = await prisma.moodTagCategory.create({
+    data: {
+      userId: ownerId,
+      key: JI_OWN_CATEGORY_KEY,
+      labelKey: "mood.tagCategory.custom",
+      icon: null,
+      sortOrder: 7,
+      labelEncrypted: encryptCustomLabel("Outdoors"),
+    },
+  });
+  const ownFactor = await prisma.moodTag.create({
+    data: {
+      userId: ownerId,
+      categoryId: ownCategory.id,
+      key: JI_OWN_FACTOR_KEY,
+      labelKey: "mood.tag.custom",
+      kind: "RATED",
+      scaleMin: 1,
+      scaleMax: 5,
+      inverse: true,
+      sortOrder: 2,
+      labelEncrypted: encryptCustomLabel("How the trail felt"),
     },
   });
   const [tag, factor] = await Promise.all([
@@ -226,6 +266,7 @@ export async function seedJsonImportOwner(
       { moodEntryId: entry.id, moodTagId: tag.id },
       { moodEntryId: entry.id, moodTagId: ownTag.id },
       { moodEntryId: entry.id, moodTagId: factor.id, rating: 4 },
+      { moodEntryId: entry.id, moodTagId: ownFactor.id, rating: 2 },
     ],
   });
   await prisma.moodContext.create({