diff --git a/gerbil-manager-web/src/genetics/__tests__/genetics.test.ts b/gerbil-manager-web/src/genetics/__tests__/genetics.test.ts
index 076db0e..12710ce 100644
--- a/gerbil-manager-web/src/genetics/__tests__/genetics.test.ts
+++ b/gerbil-manager-web/src/genetics/__tests__/genetics.test.ts
@@ -17,7 +17,7 @@ import {
   wildType,
 } from '../genotype'
 import { combineLocus } from '../punnett'
-import { farbschlagFor, CATALOG_SIZE } from '../catalog'
+import { farbschlagFor, genotypeToFarbschlag, CATALOG_SIZE } from '../catalog'
 import { breed } from '../breed'
 import { GeneticsWarningCode } from '../warnings'
 
@@ -169,6 +169,14 @@ describe('Farbschlag catalog', () => {
   it('has the expected catalogue coverage', () => {
     expect(CATALOG_SIZE).toBe(18)
   })
+
+  it('genotypeToFarbschlag (DATA-1 denormalization contract) returns the plain name', () => {
+    expect(genotypeToFarbschlag(wildType())).toBe('Agouti')
+    expect(genotypeToFarbschlag(fromDisplayString('aa CC DD EE GG pp spsp rere'))).toBe('Platin')
+    expect(genotypeToFarbschlag(fromDisplayString('aa cchmcchm dd ee gg PP spsp rere'))).toBe(
+      'Unbekannter Farbschlag',
+    )
+  })
 })
 
 describe('Partially-unknown parents (wildcards)', () => {
diff --git a/gerbil-manager-web/src/genetics/catalog.ts b/gerbil-manager-web/src/genetics/catalog.ts
index decdd06..f7f5e45 100644
--- a/gerbil-manager-web/src/genetics/catalog.ts
+++ b/gerbil-manager-web/src/genetics/catalog.ts
@@ -93,5 +93,17 @@ export function farbschlagFor(g: Genotype): FarbschlagMatch {
   return { name, base, unknown: false }
 }
 
+/**
+ * Convenience: genotype -> German Farbschlag name (with Schecke/Rex modifiers),
+ * or "Unbekannter Farbschlag". This is the DENORMALIZATION contract for DATA-1:
+ * the backend mirrors this mapping into a stored Farbschlag column (recomputed
+ * whenever the genotype changes) so Gridify list filtering/sorting never has to
+ * parse genotype strings in SQL. The catalog (BASE_COLORS) is self-contained in
+ * this file so it can be ported/kept in sync with the backend.
+ */
+export function genotypeToFarbschlag(g: Genotype): string {
+  return farbschlagFor(g).name
+}
+
 /** Number of base-colour varieties currently catalogued. */
 export const CATALOG_SIZE = BASE_COLORS.length
diff --git a/gerbil-manager-web/src/genetics/index.ts b/gerbil-manager-web/src/genetics/index.ts
index 2bb9c21..2648365 100644
--- a/gerbil-manager-web/src/genetics/index.ts
+++ b/gerbil-manager-web/src/genetics/index.ts
@@ -30,7 +30,13 @@ export type { LocusKey, LocusDef } from './loci'
 export { phenotypeTokens } from './phenotype'
 export type { PhenotypeTokens } from './phenotype'
 
-export { farbschlagFor, BASE_COLORS, CATALOG_SIZE, UNKNOWN_FARBSCHLAG } from './catalog'
+export {
+  farbschlagFor,
+  genotypeToFarbschlag,
+  BASE_COLORS,
+  CATALOG_SIZE,
+  UNKNOWN_FARBSCHLAG,
+} from './catalog'
 export type { FarbschlagEntry, FarbschlagMatch } from './catalog'
 
 export { GeneticsWarningCode } from './warnings'