diff --git a/device-plane/services/device-control-core/src/infrastructure-repository.mjs b/device-plane/services/device-control-core/src/infrastructure-repository.mjs
index bad8cc7..ebad411 100644
--- a/device-plane/services/device-control-core/src/infrastructure-repository.mjs
+++ b/device-plane/services/device-control-core/src/infrastructure-repository.mjs
@@ -221,6 +221,11 @@ async function registerModelProfile(client, actor, command) {
     schemaArtifactRef: command.schemaArtifactRef,
     capabilities: command.capabilities,
   };
+  const existingProfile = await findOptionalModelProfileRegistration(
+    client,
+    command.profileRef,
+  );
+  const adoptsLegacyProfile = isLegacyMetadataOnlyProfile(existingProfile);
   const result = await client.query(
     `insert into device_model_profiles (
       profile_ref,
@@ -237,6 +242,26 @@ async function registerModelProfile(client, actor, command) {
       lifecycle_state
     ) values ($1, $2, $3, $4, $5, $6, $7::jsonb, $8, $9, $10, $11, $12)
     on conflict (profile_ref) do update set
+      adapter_version_id = case
+        when device_model_profiles.adapter_version_id is null
+          then excluded.adapter_version_id
+        else device_model_profiles.adapter_version_id
+      end,
+      schema_artifact_ref = case
+        when device_model_profiles.schema_artifact_ref is null
+          then excluded.schema_artifact_ref
+        else device_model_profiles.schema_artifact_ref
+      end,
+      profile_digest = case
+        when device_model_profiles.profile_digest is null
+          then excluded.profile_digest
+        else device_model_profiles.profile_digest
+      end,
+      capabilities = case
+        when cardinality(device_model_profiles.capabilities) = 0
+          then excluded.capabilities
+        else device_model_profiles.capabilities
+      end,
       lifecycle_state = excluded.lifecycle_state,
       updated_at = now()
     where device_model_profiles.schema_version = excluded.schema_version
@@ -244,20 +269,39 @@ async function registerModelProfile(client, actor, command) {
       and device_model_profiles.model = excluded.model
       and device_model_profiles.device_type = excluded.device_type
       and device_model_profiles.protocol = excluded.protocol
-      and device_model_profiles.profile = excluded.profile
-      and device_model_profiles.adapter_version_id = excluded.adapter_version_id
-      and device_model_profiles.schema_artifact_ref = excluded.schema_artifact_ref
-      and device_model_profiles.profile_digest = excluded.profile_digest
-      and device_model_profiles.capabilities = excluded.capabilities
       and (
-        device_model_profiles.lifecycle_state = excluded.lifecycle_state
-        or (
-          device_model_profiles.lifecycle_state = 'draft'
-          and excluded.lifecycle_state in ('active', 'retired')
+        (
+          device_model_profiles.profile = excluded.profile
+          and device_model_profiles.adapter_version_id = excluded.adapter_version_id
+          and device_model_profiles.schema_artifact_ref = excluded.schema_artifact_ref
+          and device_model_profiles.profile_digest = excluded.profile_digest
+          and device_model_profiles.capabilities = excluded.capabilities
+          and (
+            device_model_profiles.lifecycle_state = excluded.lifecycle_state
+            or (
+              device_model_profiles.lifecycle_state = 'draft'
+              and excluded.lifecycle_state in ('active', 'retired')
+            )
+            or (
+              device_model_profiles.lifecycle_state = 'active'
+              and excluded.lifecycle_state = 'retired'
+            )
+          )
         )
         or (
-          device_model_profiles.lifecycle_state = 'active'
-          and excluded.lifecycle_state = 'retired'
+          jsonb_typeof(device_model_profiles.profile) = 'object'
+          and device_model_profiles.profile ->> 'schemaVersion' = excluded.schema_version
+          and device_model_profiles.profile ->> 'profileRef' = excluded.profile_ref
+          and device_model_profiles.profile ->> 'vendor' = excluded.vendor
+          and device_model_profiles.profile ->> 'model' = excluded.model
+          and device_model_profiles.profile ->> 'deviceType' = excluded.device_type
+          and device_model_profiles.profile ->> 'protocol' = excluded.protocol
+          and device_model_profiles.adapter_version_id is null
+          and device_model_profiles.schema_artifact_ref is null
+          and device_model_profiles.profile_digest is null
+          and cardinality(device_model_profiles.capabilities) = 0
+          and device_model_profiles.lifecycle_state = 'active'
+          and excluded.lifecycle_state = 'draft'
         )
       )
     returning profile_ref, schema_version, vendor, model, device_type,
@@ -286,7 +330,9 @@ async function registerModelProfile(client, actor, command) {
   await addAudit(client, {
     eventType: row.created
       ? "model_profile.registered"
-      : "model_profile.lifecycle_updated",
+      : adoptsLegacyProfile
+        ? "model_profile.registry_adopted"
+        : "model_profile.lifecycle_updated",
     actorRef: actor.userRef,
     payload: {
       adapterVersionRef: `adapter-version:${row.adapter_version_id}`,
@@ -302,6 +348,28 @@ async function registerModelProfile(client, actor, command) {
   };
 }
 
+async function findOptionalModelProfileRegistration(client, profileRef) {
+  const result = await client.query(
+    `select profile_ref, adapter_version_id, schema_artifact_ref,
+      profile_digest, capabilities, lifecycle_state
+    from device_model_profiles
+    where profile_ref = $1
+    for update`,
+    [profileRef],
+  );
+  return result.rows[0] ?? null;
+}
+
+function isLegacyMetadataOnlyProfile(profile) {
+  return profile != null
+    && profile.adapter_version_id == null
+    && profile.schema_artifact_ref == null
+    && profile.profile_digest == null
+    && Array.isArray(profile.capabilities)
+    && profile.capabilities.length === 0
+    && profile.lifecycle_state === "active";
+}
+
 async function ensureEdge(client, actor, command) {
   assertPlatformCatalogAuthority(actor);
   const channelProvided = command.channel !== undefined;
diff --git a/device-plane/services/device-control-core/test/infrastructure-lifecycle-contract.test.mjs b/device-plane/services/device-control-core/test/infrastructure-lifecycle-contract.test.mjs
index 3afa4a1..a0561c8 100644
--- a/device-plane/services/device-control-core/test/infrastructure-lifecycle-contract.test.mjs
+++ b/device-plane/services/device-control-core/test/infrastructure-lifecycle-contract.test.mjs
@@ -17,3 +17,17 @@ test("catalog, Edge and route upserts enforce irreversible lifecycle transitions
   assert.doesNotMatch(source, /device_(?:adapter_versions|model_profiles|edges|routes)\.lifecycle_state = 'retired'[\s\S]{0,160}excluded\.lifecycle_state = 'active'/);
 });
 
+test("legacy model adoption is a one-way exact-identity registry transition", async () => {
+  const source = await readFile(
+    new URL("../src/infrastructure-repository.mjs", import.meta.url),
+    "utf8",
+  );
+
+  assert.match(source, /profile ->> 'schemaVersion' = excluded\.schema_version/);
+  assert.match(source, /profile ->> 'profileRef' = excluded\.profile_ref/);
+  assert.match(source, /profile ->> 'vendor' = excluded\.vendor/);
+  assert.match(source, /profile ->> 'model' = excluded\.model/);
+  assert.match(source, /profile ->> 'deviceType' = excluded\.device_type/);
+  assert.match(source, /profile ->> 'protocol' = excluded\.protocol/);
+  assert.match(source, /adapter_version_id is null[\s\S]*schema_artifact_ref is null[\s\S]*profile_digest is null[\s\S]*cardinality\(device_model_profiles\.capabilities\) = 0[\s\S]*lifecycle_state = 'active'[\s\S]*excluded\.lifecycle_state = 'draft'/);
+});
diff --git a/device-plane/services/device-control-core/test/infrastructure-repository.test.mjs b/device-plane/services/device-control-core/test/infrastructure-repository.test.mjs
index ba28534..79e7e47 100644
--- a/device-plane/services/device-control-core/test/infrastructure-repository.test.mjs
+++ b/device-plane/services/device-control-core/test/infrastructure-repository.test.mjs
@@ -10,6 +10,8 @@ const now = new Date("2026-08-10T00:00:00.000Z");
 const projectId = "11111111-1111-4111-8111-111111111111";
 const edgeId = "22222222-2222-4222-8222-222222222222";
 const routeId = "33333333-3333-4333-8333-333333333333";
+const adapterPackageId = "44444444-4444-4444-8444-444444444444";
+const adapterVersionId = "55555555-5555-4555-8555-555555555555";
 
 test("commits an owner-authorized generic Edge registration", async () => {
   const actor = managementActor("owner");
@@ -55,6 +57,147 @@ test("commits an owner-authorized generic Edge registration", async () => {
   assert.equal(client.released, true);
 });
 
+test("adopts a legacy metadata-only model profile into the versioned registry", async () => {
+  const actor = managementActor("owner");
+  const command = normalizeDeviceManagementCommand("model_profile.register", {
+    adapterVersionRef: `adapter-version:${adapterVersionId}`,
+    profileRef: "vendor.model.protocol.v1",
+    schemaVersion: "nodedc.device-model-profile.v1",
+    vendor: "Example Vendor",
+    model: "Model One",
+    deviceType: "tracker",
+    protocol: "GENERIC_TCP",
+    schemaArtifactRef: "artifact:model-profiles/vendor-model-v1",
+    profileDigest: `sha256:${"e".repeat(64)}`,
+    capabilities: ["telemetry.observe"],
+  });
+  const client = scriptedClient([
+    step("begin"),
+    step("insert into device_management_command_receipts", {
+      rows: [{ id: "receipt-profile" }],
+    }),
+    step("from device_adapter_versions av", {
+      rows: [{
+        id: adapterVersionId,
+        adapter_package_id: adapterPackageId,
+        version: "1.0.0",
+        runtime_package_ref: "artifact:device-adapters/vendor-model-1.0.0",
+        content_digest: `sha256:${"f".repeat(64)}`,
+        contract_version: "nodedc.device-adapter.v1",
+        capabilities: ["telemetry.observe"],
+        lifecycle_state: "active",
+        package_lifecycle_state: "active",
+        created_at: now,
+        updated_at: now,
+      }],
+    }),
+    step("from device_model_profiles", {
+      rows: [{
+        profile_ref: command.profileRef,
+        adapter_version_id: null,
+        schema_artifact_ref: null,
+        profile_digest: null,
+        capabilities: [],
+        lifecycle_state: "active",
+      }],
+    }),
+    step("insert into device_model_profiles", {
+      rows: [{
+        profile_ref: command.profileRef,
+        schema_version: command.schemaVersion,
+        vendor: command.vendor,
+        model: command.model,
+        device_type: command.deviceType,
+        protocol: command.protocol,
+        adapter_version_id: adapterVersionId,
+        schema_artifact_ref: command.schemaArtifactRef,
+        profile_digest: command.profileDigest,
+        capabilities: command.capabilities,
+        lifecycle_state: "draft",
+        created_at: now,
+        updated_at: now,
+        created: false,
+      }],
+    }),
+    step("insert into device_audit_events"),
+    step("update device_management_command_receipts"),
+    step("commit"),
+  ]);
+  const repository = repositoryWithClient(client);
+
+  const result = await repository.executeManagementCommand(commandInput({
+    actor,
+    commandKind: "model_profile.register",
+    command,
+    digestCharacter: "e",
+  }));
+
+  assert.equal(result.replayed, false);
+  assert.equal(result.result.created, false);
+  assert.equal(
+    result.result.modelProfile.adapterVersionRef,
+    `adapter-version:${adapterVersionId}`,
+  );
+  assert.equal(result.result.modelProfile.lifecycleState, "draft");
+  assert.equal(client.remaining(), 0);
+  assert.equal(client.released, true);
+});
+
+test("keeps non-legacy model profile identity conflicts fail-closed", async () => {
+  const actor = managementActor("owner");
+  const command = normalizeDeviceManagementCommand("model_profile.register", {
+    adapterVersionRef: `adapter-version:${adapterVersionId}`,
+    profileRef: "vendor.model.protocol.v1",
+    schemaVersion: "nodedc.device-model-profile.v1",
+    vendor: "Example Vendor",
+    model: "Model One",
+    deviceType: "tracker",
+    protocol: "GENERIC_TCP",
+    schemaArtifactRef: "artifact:model-profiles/vendor-model-v1",
+    profileDigest: `sha256:${"e".repeat(64)}`,
+    capabilities: ["telemetry.observe"],
+  });
+  const client = scriptedClient([
+    step("begin"),
+    step("insert into device_management_command_receipts", {
+      rows: [{ id: "receipt-profile-conflict" }],
+    }),
+    step("from device_adapter_versions av", {
+      rows: [{
+        id: adapterVersionId,
+        adapter_package_id: adapterPackageId,
+        lifecycle_state: "active",
+        package_lifecycle_state: "active",
+      }],
+    }),
+    step("from device_model_profiles", {
+      rows: [{
+        profile_ref: command.profileRef,
+        adapter_version_id: null,
+        schema_artifact_ref: "artifact:legacy-but-partial",
+        profile_digest: null,
+        capabilities: [],
+        lifecycle_state: "active",
+      }],
+    }),
+    step("insert into device_model_profiles"),
+    step("rollback"),
+  ]);
+  const repository = repositoryWithClient(client);
+
+  await assert.rejects(
+    repository.executeManagementCommand(commandInput({
+      actor,
+      commandKind: "model_profile.register",
+      command,
+      digestCharacter: "f",
+    })),
+    /device_model_profile_identity_conflict/,
+  );
+  assert.equal(client.remaining(), 0);
+  assert.equal(client.released, true);
+});
+
 test("denies project route mutation without an explicit project grant", async () => {
   const actor = managementActor("owner");
   const command = normalizeDeviceManagementCommand("route.ensure", {