diff --git a/server/__tests__/lane-profile.test.js b/server/__tests__/lane-profile.test.js
index 78ae281..73949c7 100644
--- a/server/__tests__/lane-profile.test.js
+++ b/server/__tests__/lane-profile.test.js
@@ -90,3 +90,24 @@ describe("hookEnv extraEnv", () => {
     slots.releaseSlot(lane.id);
   });
 });
+
+describe("resolveProfile — E2 declarations", () => {
+  it("defaults MIGRATIONS_DIR to empty and GENERATED_MERGE_PATHS to an empty array", () => {
+    const lane = makeLane();
+    writeProfile(lane.cwd, "PORTS=api\n");
+    const profile = profileLib.resolveProfile(lanesLib.getLane(lane.id));
+    assert.equal(profile.env.MIGRATIONS_DIR, "");
+    assert.deepEqual(profile.generatedMergePaths, []);
+  });
+
+  it("parses declared MIGRATIONS_DIR and GENERATED_MERGE_PATHS", () => {
+    const lane = makeLane();
+    writeProfile(
+      lane.cwd,
+      'PORTS=api\nMIGRATIONS_DIR="db/migrations"\nGENERATED_MERGE_PATHS="api/openapi.json api/client.ts"\n'
+    );
+    const profile = profileLib.resolveProfile(lanesLib.getLane(lane.id));
+    assert.equal(profile.env.MIGRATIONS_DIR, "db/migrations");
+    assert.deepEqual(profile.generatedMergePaths, ["api/openapi.json", "api/client.ts"]);
+  });
+});
diff --git a/server/lib/lane-profile.js b/server/lib/lane-profile.js
index 8bdd3b1..e930e8b 100644
--- a/server/lib/lane-profile.js
+++ b/server/lib/lane-profile.js
@@ -76,6 +76,15 @@ const DEFAULTS = Object.freeze({
   // stack `ship-feature-lane`'s Stage 3 boots for QC. Empty = off, same as
   // every declaration above.
   QC_BOOT_ENV: "",
+  // E2: repo-relative path to a numbered-migrations directory (e.g.
+  // "db/migrations"), consumed by sync-base's collision preflight. Empty =
+  // off, same DEFAULTS pattern as every declaration above.
+  MIGRATIONS_DIR: "",
+  // E2: space-separated repo-relative paths given a keep-ours merge driver
+  // by sync-base's merge mode and regenerated post-merge by the profile's
+  // `regen` hook (e.g. an OpenAPI contract + its generated client). Empty =
+  // off — no driver installed, no regen fold-in attempted.
+  GENERATED_MERGE_PATHS: "",
 });
 
 /**
@@ -173,6 +182,7 @@ function resolveProfile(lane) {
       hooks,
       ports: splitList(env.PORTS),
       laneDirs: splitList(env.LANE_DIRS),
+      generatedMergePaths: splitList(env.GENERATED_MERGE_PATHS),
     };
   }
   return null;