diff --git a/apps/roam/src/utils/discoverSharedRelations.ts b/apps/roam/src/utils/discoverSharedRelations.ts
new file mode 100644
index 000000000..983b18353
--- /dev/null
+++ b/apps/roam/src/utils/discoverSharedRelations.ts
@@ -0,0 +1,253 @@
+import type { DGSupabaseClient } from "@repo/database/lib/client";
+import type {
+  CrossAppRelation,
+  CrossAppRelationTypeSchema,
+  CrossAppRelationTripleSchema,
+  CrossAppNodeSchema,
+} from "@repo/database/crossAppContracts";
+import {
+  getAccountMap,
+  getSpaceMap,
+  dbRelationTripleSchemasToCrossApp,
+  dbRelationsToCrossApp,
+  dbRelationTypeSchemasToCrossApp,
+  dbNodeSchemasToCrossApp,
+} from "@repo/database/lib/dbToCrossAppConverters";
+import { Tables } from "@repo/database/dbTypes";
+import { spaceUriAndLocalIdToRid } from "@repo/database/lib/rid";
+import { getImportedSourceRids } from "./importedSourceIdentity";
+
+type Concept = Tables<"Concept">;
+
+export type DiscoverSharedRelationsResult = {
+  relations: CrossAppRelation[];
+  relTripleSchemas: CrossAppRelationTripleSchema[];
+  relTypeSchemas: CrossAppRelationTypeSchema[];
+  nodeSchemas: CrossAppNodeSchema[];
+};
+
+export const discoverSharedRelations = async (
+  client: DGSupabaseClient,
+  spaceId: number,
+  futureImportRids?: string[],
+): Promise<DiscoverSharedRelationsResult> => {
+  const response: DiscoverSharedRelationsResult = {
+    relations: [],
+    relTripleSchemas: [],
+    relTypeSchemas: [],
+    nodeSchemas: [],
+  };
+  // TODO: paginate
+  const { data: dbAllImportableRelations, error: relError } = await client
+    .from("my_concepts")
+    .select(
+      "*, concepts_of_relation!inner(id, space_id, source_local_id, schema_id)",
+    )
+    .neq("space_id", spaceId)
+    .eq("is_schema", false)
+    .eq("is_relation", true);
+
+  if (relError) throw relError;
+  if (!dbAllImportableRelations || dbAllImportableRelations.length === 0)
+    return response;
+  const relatedNodeInfo = dbAllImportableRelations
+    .map((r) => r.concepts_of_relation)
+    .flat();
+  const spaceIds = new Set(relatedNodeInfo.map(({ space_id }) => space_id!));
+  const spaceMap = await getSpaceMap(client, [...spaceIds]);
+  const toRid = (spaceId: number, localId: string) =>
+    spaceId in spaceMap
+      ? spaceUriAndLocalIdToRid(spaceMap[spaceId], localId, "note")
+      : undefined;
+  const idToRid: Record<number, string> = Object.fromEntries(
+    relatedNodeInfo
+      .map(
+        ({ id, space_id, source_local_id }): [number, string] | undefined => {
+          if (id === null || space_id === null || source_local_id === null)
+            return;
+          const rid = toRid(space_id, source_local_id);
+          if (rid === undefined) return;
+          return [id, rid];
+        },
+      )
+      .filter((x) => x !== undefined),
+  );
+
+  // We want those relations whose source/destinations are either already imported,
+  // or somehow connected by Rid to local nodes.
+  const refToLocalIds = new Set(
+    relatedNodeInfo
+      .filter(({ space_id }) => space_id === spaceId)
+      .map(({ id }) => id),
+  );
+  const importedNodeRids = await getImportedSourceRids();
+  if (futureImportRids !== undefined) {
+    futureImportRids.forEach((id) => importedNodeRids.add(id));
+  }
+  const dbRelations = dbAllImportableRelations.filter((r) => {
+    const references = (r.reference_content || {}) as Record<string, number>;
+    const sourceId = references["source"];
+    const destinationId = references["destination"];
+    if (!sourceId || !destinationId) return false;
+    return (
+      (refToLocalIds.has(sourceId) ||
+        importedNodeRids.has(idToRid[sourceId] ?? "")) &&
+      (refToLocalIds.has(destinationId) ||
+        importedNodeRids.has(idToRid[destinationId] ?? ""))
+    );
+  });
+  const relationSchemaIds = new Set(
+    dbRelations.map((r) => r.schema_id).filter((r) => r !== null),
+  );
+  if (relationSchemaIds.size === 0) return response;
+  const { data: dbRelSchemas, error: relSchError } = await client
+    .from("my_concepts")
+    .select()
+    .in("id", [...relationSchemaIds]);
+  if (relSchError) throw relSchError;
+  if (!dbRelSchemas) throw new Error("Missing schemas");
+  const dbRelTripleSchemasDirect = dbRelSchemas.filter(
+    (r) => r.refs !== null && r.refs.length > 0,
+  ) as Concept[];
+  const dbRelTypeSchemasDirect = dbRelSchemas.filter(
+    (r) => r.refs === null || r.refs.length === 0,
+  ) as Concept[];
+  let dbRelTripleSchemas = dbRelTripleSchemasDirect;
+  let dbRelTypeSchemas = dbRelTypeSchemasDirect;
+
+  const missingRelationTypeSchemaIds = new Set<number>(
+    dbRelTripleSchemasDirect
+      .map(
+        (r) =>
+          (typeof r.reference_content === "object"
+            ? (r.reference_content as Record<string, number>)
+            : {})["relation_type"],
+      )
+      .filter((id) => id !== undefined),
+  );
+
+  if (missingRelationTypeSchemaIds.size > 0) {
+    const { data, error: tysError } = await client
+      .from("my_concepts")
+      .select()
+      .in("id", [...missingRelationTypeSchemaIds]);
+    if (tysError) throw tysError;
+    if (!data) throw new Error("Missing relation type schemas");
+    dbRelTypeSchemas = [...dbRelTypeSchemasDirect, ...(data as Concept[])];
+  }
+  // Obsidian relation instances point to the RelationType,
+  // so we need to filter relevant RelationTriples
+  // according to the relation instance's type signatures
+  if (dbRelTypeSchemasDirect.length) {
+    // Fetch all corresponding triples and filter
+    const relTypeIds = dbRelTypeSchemasDirect.map((r) => r.id);
+    const { data, error: trsError } = await client
+      .from("my_concepts")
+      .select()
+      .eq("is_schema", true)
+      .eq("is_relation", true)
+      .overlaps("refs", relTypeIds);
+    if (trsError) throw trsError;
+    if (!data) throw new Error("Missing relation triple schemas");
+    const triplesBySchemaId: Record<number, Concept[]> = Object.fromEntries(
+      relTypeIds.map((id) => [id, []]),
+    );
+    data.forEach((c) => {
+      const triplesArray =
+        triplesBySchemaId[
+          ((c.reference_content ?? {}) as Record<string, number>)[
+            "relation_type"
+          ]
+        ];
+      if (triplesArray !== undefined) triplesArray.push(c as Concept);
+    });
+    const tripleIds = new Set<number>();
+    for (const relation of dbRelations) {
+      const potentialTriples = triplesBySchemaId[relation.schema_id || 0];
+      if (potentialTriples === undefined) continue;
+      const refs = (relation.reference_content || {}) as Record<string, number>;
+      const sourceContent = relation.concepts_of_relation.filter(
+        (cr) => cr.id === refs["source"],
+      );
+      const destinationContent = relation.concepts_of_relation.filter(
+        (cr) => cr.id === refs["destination"],
+      );
+      if (sourceContent.length !== 1 || destinationContent.length !== 1)
+        continue;
+      const matches = potentialTriples.filter(
+        (triple) =>
+          ((triple.reference_content ?? {}) as Record<string, number>)[
+            "source"
+          ] === sourceContent[0].schema_id &&
+          ((triple.reference_content ?? {}) as Record<string, number>)[
+            "destination"
+          ] === destinationContent[0].schema_id,
+      );
+      if (matches.length === 1) {
+        const relationTripleSchemaId = matches[0].id;
+        tripleIds.add(relationTripleSchemaId);
+        // prentend that the obsidian relation referred to the triple
+        // for when we convert
+        relation.schema_id = relationTripleSchemaId;
+      }
+    }
+    dbRelTripleSchemas = [
+      ...dbRelTripleSchemasDirect,
+      ...(data as Concept[]).filter((tr) => tripleIds.has(tr.id || 0)),
+    ];
+  }
+  const nodeTypeSchemaIds = new Set<number>(
+    dbRelTripleSchemas
+      .map((r) => {
+        const refs = (r.reference_content || {}) as Record<string, number>;
+        return [refs.source, refs.destination];
+      })
+      .flat()
+      .filter((id) => id !== undefined),
+  );
+  const { data: dbNodeTypeSchemas, error: nsError } = await client
+    .from("my_concepts")
+    .select()
+    .in("id", [...nodeTypeSchemaIds]);
+  if (nsError) throw nsError;
+  if (!dbNodeTypeSchemas) throw new Error("Missing relation type schemas");
+  const authorIds = [
+    ...dbRelations,
+    ...dbRelTripleSchemas,
+    ...dbRelTypeSchemas,
+    ...dbNodeTypeSchemas,
+  ]
+    .map((r) => r.author_id)
+    .filter((id) => id !== null);
+  const accountMap = await getAccountMap(client, [...new Set(authorIds)]);
+  const relTypeSchemas = await dbRelationTypeSchemasToCrossApp({
+    client,
+    schemas: dbRelTypeSchemas,
+    spaceMap,
+    accountMap,
+  });
+  const relTripleSchemas = await dbRelationTripleSchemasToCrossApp({
+    client,
+    schemas: dbRelTripleSchemas,
+    spaceMap,
+    accountMap,
+  });
+  const relations = await dbRelationsToCrossApp({
+    client,
+    relations: dbRelations as Concept[],
+    accountMap,
+    spaceMap,
+  });
+  const nodeSchemas = await dbNodeSchemasToCrossApp({
+    client,
+    schemas: dbNodeTypeSchemas as Concept[],
+    spaceMap,
+    accountMap,
+  });
+  return {
+    relations,
+    relTripleSchemas,
+    relTypeSchemas,
+    nodeSchemas,
+  };
+};