diff --git a/packages/accounts/db.integration.test.ts b/packages/accounts/db.integration.test.ts
index 61170ec..3011323 100644
--- a/packages/accounts/db.integration.test.ts
+++ b/packages/accounts/db.integration.test.ts
@@ -221,6 +221,25 @@ describe("org-member", () => {
     expect(owners.length).toBe(1);
     expect(owners[0]?.identityId).toBe(owner2.id);
   });
+
+  test("delete org cascades to org_member even when sole owner exists", async () => {
+    // Regression: previously the org_member_owner_check trigger refused
+    // the cascade, making it impossible to delete an org you owned. The
+    // invariant now lives in removeMember/updateRole so the cascade
+    // proceeds unimpeded.
+    const org = await db.createOrg({ name: "Sole Owner Cascade" });
+    const identity = await db.createIdentity({
+      email: "sole-owner-cascade@example.com",
+      name: "Sole Owner",
+    });
+    await db.addMember(org.id, identity.id, "owner");
+
+    const deleted = await db.deleteOrg(org.id);
+    expect(deleted).toBe(true);
+
+    const members = await db.listMembers(org.id);
+    expect(members.length).toBe(0);
+  });
 });
 
 // ---------------------------------------------------------------------------
diff --git a/packages/accounts/migrate/migrations/008_drop_org_owner_trigger.sql b/packages/accounts/migrate/migrations/008_drop_org_owner_trigger.sql
new file mode 100644
index 0000000..260efbf
--- /dev/null
+++ b/packages/accounts/migrate/migrations/008_drop_org_owner_trigger.sql
@@ -0,0 +1,13 @@
+-- Remove the "must keep at least one owner" trigger on org_member.
+--
+-- The trigger fired before any DELETE or UPDATE on org_member, including
+-- the rows cascaded by `delete from org` (since org_member.org_id has
+-- `references org on delete cascade`). When an org was being deleted in
+-- its entirety, the cascade removed the org's owner row too, and the
+-- trigger refused — making it impossible to delete an org that you owned.
+--
+-- The invariant is now enforced at the application layer in
+-- packages/accounts/ops/org-member.ts (removeMember + updateRole), where
+-- it can distinguish member-management flows from a cascading org delete.
+drop trigger if exists org_member_owner_check on {{schema}}.org_member;
+drop function if exists {{schema}}.check_org_has_owner();
diff --git a/packages/accounts/migrate/runner.ts b/packages/accounts/migrate/runner.ts
index aea8d3d..28f830a 100644
--- a/packages/accounts/migrate/runner.ts
+++ b/packages/accounts/migrate/runner.ts
@@ -18,6 +18,9 @@ import migration006 from "./migrations/006_ops_support.sql" with {
 import migration007 from "./migrations/007_device_authorization.sql" with {
   type: "text",
 };
+import migration008 from "./migrations/008_drop_org_owner_trigger.sql" with {
+  type: "text",
+};
 import { type AccountsConfig, resolveConfig, template } from "./template";
 
 interface Migration {
@@ -33,6 +36,7 @@ const migrations: Migration[] = [
   { name: "005_auth", sql: migration005 },
   { name: "006_ops_support", sql: migration006 },
   { name: "007_device_authorization", sql: migration007 },
+  { name: "008_drop_org_owner_trigger", sql: migration008 },
 ];
 
 export interface MigrateResult {
diff --git a/packages/accounts/ops/org-member.ts b/packages/accounts/ops/org-member.ts
index 56ca1f7..9ea7e2b 100644
--- a/packages/accounts/ops/org-member.ts
+++ b/packages/accounts/ops/org-member.ts
@@ -27,10 +27,37 @@ function rowToOrgMember(row: OrgMemberRow): OrgMember {
 }
 
 /**
- * Check if a PostgreSQL error is the "org_must_have_owner" trigger exception
+ * Verify that removing or demoting `identityId` from `orgId` would leave at
+ * least one other owner in place. Throws ORG_MUST_HAVE_OWNER otherwise.
+ *
+ * The query takes `for update` row locks on every other owner row in the
+ * org. This closes the race where two concurrent transactions, each
+ * removing a different owner, both observe the other's row as still
+ * present and proceed — leaving the org with zero owners. With `for
+ * update`, the second transaction blocks on the first's row locks, sees
+ * the post-commit count, and correctly fails. The previous DB trigger
+ * had the same race; this hardens it.
  */
-function isOrgOwnerError(err: unknown): boolean {
-  return err instanceof Error && err.message?.includes("org_must_have_owner");
+async function assertAnotherOwnerExists(
+  sql: import("bun").SQL,
+  schema: string,
+  orgId: string,
+  identityId: string,
+): Promise<void> {
+  const rows = await sql<{ identity_id: string }[]>`
+    select identity_id
+    from ${sql.unsafe(schema)}.org_member
+    where org_id = ${orgId}
+      and role = 'owner'
+      and identity_id <> ${identityId}
+    for update
+  `;
+  if (rows.length === 0) {
+    throw new AccountsError(
+      "ORG_MUST_HAVE_OWNER",
+      "Cannot remove the last owner from an organization",
+    );
+  }
 }
 
 export function orgMemberOps(ctx: AccountsContext) {
@@ -63,21 +90,25 @@ export function orgMemberOps(ctx: AccountsContext) {
 
     async removeMember(orgId: string, identityId: string): Promise<boolean> {
       return withTx(ctx, "removeMember", async (sql) => {
-        try {
-          const result = await sql`
-            delete from ${sql.unsafe(schema)}.org_member
-            where org_id = ${orgId} and identity_id = ${identityId}
-          `;
-          return result.count > 0;
-        } catch (err) {
-          if (isOrgOwnerError(err)) {
-            throw new AccountsError(
-              "ORG_MUST_HAVE_OWNER",
-              "Cannot remove the last owner from an organization",
-            );
-          }
-          throw err;
+        // Fetch the target row with `for update` so the row stays stable
+        // under our feet while we decide whether to delete it.
+        const [target] = await sql<{ role: OrgRole }[]>`
+          select role
+          from ${sql.unsafe(schema)}.org_member
+          where org_id = ${orgId} and identity_id = ${identityId}
+          for update
+        `;
+        if (!target) return false;
+
+        if (target.role === "owner") {
+          await assertAnotherOwnerExists(sql, schema, orgId, identityId);
         }
+
+        const result = await sql`
+          delete from ${sql.unsafe(schema)}.org_member
+          where org_id = ${orgId} and identity_id = ${identityId}
+        `;
+        return result.count > 0;
       });
     },
 
@@ -87,22 +118,26 @@ export function orgMemberOps(ctx: AccountsContext) {
       newRole: OrgRole,
     ): Promise<boolean> {
       return withTx(ctx, "updateRole", async (sql) => {
-        try {
-          const result = await sql`
-            update ${sql.unsafe(schema)}.org_member
-            set role = ${newRole}
-            where org_id = ${orgId} and identity_id = ${identityId}
-          `;
-          return result.count > 0;
-        } catch (err) {
-          if (isOrgOwnerError(err)) {
-            throw new AccountsError(
-              "ORG_MUST_HAVE_OWNER",
-              "Cannot remove the last owner from an organization",
-            );
-          }
-          throw err;
+        const [target] = await sql<{ role: OrgRole }[]>`
+          select role
+          from ${sql.unsafe(schema)}.org_member
+          where org_id = ${orgId} and identity_id = ${identityId}
+          for update
+        `;
+        if (!target) return false;
+
+        // Only block the transition that would orphan the org: an owner
+        // being changed to anything other than owner.
+        if (target.role === "owner" && newRole !== "owner") {
+          await assertAnotherOwnerExists(sql, schema, orgId, identityId);
         }
+
+        const result = await sql`
+          update ${sql.unsafe(schema)}.org_member
+          set role = ${newRole}
+          where org_id = ${orgId} and identity_id = ${identityId}
+        `;
+        return result.count > 0;
       });
     },