diff --git a/packages/database/src/lib/crossAppConverters.ts b/packages/database/src/lib/crossAppConverters.ts
index d5c9dfc9f..5c34ea5ea 100644
--- a/packages/database/src/lib/crossAppConverters.ts
+++ b/packages/database/src/lib/crossAppConverters.ts
@@ -5,6 +5,9 @@ import {
   InlineCrossAppContent,
   CrossAppBase,
   CrossAppNode,
+  CrossAppNodeSchema,
+  CrossAppRelationTypeSchema,
+  CrossAppRelationTripleSchema,
 } from "../crossAppContracts";
 import { LocalContentDataInput, LocalConceptDataInput } from "../inputTypes";
 import { Enums, CompositeTypes } from "../dbTypes";
@@ -109,3 +112,92 @@ export const crossAppNodeToDbConcept = (
     last_modified: node.modifiedAt?.toISOString(),
   });
 };
+
+export const crossAppNodeSchemaToDbConcept = (
+  node: CrossAppNodeSchema,
+): LocalConceptDataInput => {
+  const literalInfo = filterUndefined({
+    template: node.templateTitle,
+    templateContent: node.template,
+  });
+  return filterUndefined<LocalConceptDataInput>({
+    ...decodeLocalRef(node, "source_local_id"),
+    name: node.label,
+    ...decodeRef(node.author, "author_id", "author_local_id"),
+    is_schema: true,
+    literal_content:
+      Object.keys(literalInfo).length > 0 ? literalInfo : undefined,
+    created: node.createdAt?.toISOString(),
+    last_modified: node.modifiedAt?.toISOString(),
+  });
+};
+
+export const crossAppRelationTypeSchemaToDbConcept = (
+  node: CrossAppRelationTypeSchema,
+): LocalConceptDataInput => {
+  return filterUndefined<LocalConceptDataInput>({
+    ...decodeLocalRef(node, "source_local_id"),
+    name: node.label,
+    ...decodeRef(node.author, "author_id", "author_local_id"),
+    is_schema: true,
+    literal_content: {
+      roles: ["source", "destination"],
+      label: node.label,
+      complement: node.complement,
+    },
+    created: node.createdAt?.toISOString(),
+    last_modified: node.modifiedAt?.toISOString(),
+  });
+};
+
+export const crossAppRelationTripleSchemaToDbConcept = ({
+  node,
+  sourceNodeSchema,
+  destinationNodeSchema,
+  relationType,
+}: {
+  node: CrossAppRelationTripleSchema;
+  sourceNodeSchema: CrossAppNodeSchema;
+  destinationNodeSchema: CrossAppNodeSchema;
+  relationType?: CrossAppRelationTypeSchema;
+}): LocalConceptDataInput | undefined => {
+  // relationType must be provided if relation-based triple.
+  if (!("label" in node) && relationType === undefined) return undefined;
+  const label = "label" in node ? node.label : relationType!.label;
+  const complement =
+    "complement" in node ? node.complement : relationType!.complement;
+
+  const relData = {
+    ...decodeRef(
+      "relation" in node ? node.relation : undefined,
+      "relation_type",
+      "relation_type_local_id",
+    ),
+    ...decodeRef(node.sourceType, "source", "source_local_id"),
+    ...decodeRef(node.destinationType, "destination", "destination_local_id"),
+  };
+  const refLocalIds = Object.fromEntries(
+    Object.entries(relData)
+      .filter(([k]) => k.endsWith("_local_id"))
+      .map(([k, v]) => [k.substring(0, k.length - 9), v]),
+  ) as Record<string, string>;
+  const refIds = Object.fromEntries(
+    Object.entries(relData).filter(([k]) => !k.endsWith("_local_id")),
+  ) as Record<string, number>;
+  return filterUndefined<LocalConceptDataInput>({
+    ...decodeLocalRef(node, "source_local_id"),
+    name: `${sourceNodeSchema.label} -${label}-> ${destinationNodeSchema.label}`,
+    ...decodeRef(node.author, "author_id", "author_local_id"),
+    is_schema: true,
+    literal_content: filterUndefined({
+      roles: ["source", "destination"],
+      label,
+      complement,
+    }),
+    local_reference_content:
+      Object.keys(refLocalIds).length > 0 ? refLocalIds : undefined,
+    reference_content: Object.keys(refIds).length > 0 ? refIds : undefined,
+    created: node.createdAt?.toISOString(),
+    last_modified: node.modifiedAt?.toISOString(),
+  });
+};