diff --git a/src/db/repositories.ts b/src/db/repositories.ts
index 5d94002c85..04567a9b08 100644
--- a/src/db/repositories.ts
+++ b/src/db/repositories.ts
@@ -1312,20 +1312,24 @@ function toIssueWatchSubscription(row: typeof issueWatchSubscriptions.$inferSele
 }
 
 /** Subscribe a miner to a repo's new grabbable issues; idempotent on (login, repo) — re-subscribing just
- *  updates the label filter. `labels` ([]=any) are lowercased for case-insensitive matching at delivery. */
+ *  updates the label filter. `login`, `repoFullName`, and `labels` ([]=any) are all lowercased so matching
+ *  is case-insensitive: GitHub repo names are case-insensitive, and the delivery lookup keys off the
+ *  webhook's canonical `repository.full_name`, so a watch stored under a different casing must still match. */
 export async function upsertIssueWatchSubscription(env: Env, input: { login: string; repoFullName: string; labels?: string[] | undefined }): Promise<IssueWatchSubscription> {
   const db = getDb(env.DB);
   const login = input.login.toLowerCase();
+  const repoFullName = input.repoFullName.toLowerCase();
   const labels = [...new Set((input.labels ?? []).map((label) => label.toLowerCase().trim()).filter(Boolean))];
   await db
     .insert(issueWatchSubscriptions)
-    .values({ id: crypto.randomUUID(), login, repoFullName: input.repoFullName, labelsJson: jsonString(labels), updatedAt: nowIso() })
+    .values({ id: crypto.randomUUID(), login, repoFullName, labelsJson: jsonString(labels), updatedAt: nowIso() })
     .onConflictDoUpdate({ target: [issueWatchSubscriptions.login, issueWatchSubscriptions.repoFullName], set: { labelsJson: jsonString(labels), updatedAt: nowIso() } });
   const [row] = await db
     .select()
     .from(issueWatchSubscriptions)
-    .where(and(eq(issueWatchSubscriptions.login, login), eq(issueWatchSubscriptions.repoFullName, input.repoFullName)));
-  return row ? toIssueWatchSubscription(row) : { login, repoFullName: input.repoFullName, labels };
+    .where(and(eq(issueWatchSubscriptions.login, login), eq(issueWatchSubscriptions.repoFullName, repoFullName)));
+  /* v8 ignore next -- the row always exists immediately after the upsert above; the literal is a type-safety fallback. */
+  return row ? toIssueWatchSubscription(row) : { login, repoFullName, labels };
 }
 
 export async function listIssueWatchSubscriptionsForLogin(env: Env, login: string): Promise<IssueWatchSubscription[]> {
@@ -1337,19 +1341,17 @@ export async function listIssueWatchSubscriptionsForLogin(env: Env, login: strin
 /** Returns whether a watch existed and was removed (so the caller can report it accurately). */
 export async function deleteIssueWatchSubscription(env: Env, login: string, repoFullName: string): Promise<boolean> {
   const db = getDb(env.DB);
-  const existing = await db
-    .select({ id: issueWatchSubscriptions.id })
-    .from(issueWatchSubscriptions)
-    .where(and(eq(issueWatchSubscriptions.login, login.toLowerCase()), eq(issueWatchSubscriptions.repoFullName, repoFullName)));
+  const where = and(eq(issueWatchSubscriptions.login, login.toLowerCase()), eq(issueWatchSubscriptions.repoFullName, repoFullName.toLowerCase()));
+  const existing = await db.select({ id: issueWatchSubscriptions.id }).from(issueWatchSubscriptions).where(where);
   if (existing.length === 0) return false;
-  await db.delete(issueWatchSubscriptions).where(and(eq(issueWatchSubscriptions.login, login.toLowerCase()), eq(issueWatchSubscriptions.repoFullName, repoFullName)));
+  await db.delete(issueWatchSubscriptions).where(where);
   return true;
 }
 
 /** All miners watching a repo — the candidate recipients when a new grabbable issue opens there. */
 export async function listIssueWatchersForRepo(env: Env, repoFullName: string): Promise<IssueWatchSubscription[]> {
   const db = getDb(env.DB);
-  const rows = await db.select().from(issueWatchSubscriptions).where(eq(issueWatchSubscriptions.repoFullName, repoFullName)).limit(5000);
+  const rows = await db.select().from(issueWatchSubscriptions).where(eq(issueWatchSubscriptions.repoFullName, repoFullName.toLowerCase())).limit(5000);
   return rows.map(toIssueWatchSubscription);
 }
 
diff --git a/test/unit/issue-watch.test.ts b/test/unit/issue-watch.test.ts
index 171faf05bb..98bfb78594 100644
--- a/test/unit/issue-watch.test.ts
+++ b/test/unit/issue-watch.test.ts
@@ -50,6 +50,27 @@ describe("issue-watch subscriptions (CRUD)", () => {
     expect(await deleteIssueWatchSubscription(env, "miner", "owner/repo")).toBe(false); // already gone
     expect(await listIssueWatchSubscriptionsForLogin(env, "miner")).toHaveLength(0);
   });
+
+  it("matches the watched repo case-insensitively (GitHub repo names are case-insensitive)", async () => {
+    const env = createTestEnv();
+    // owner/repo is a tracked PUBLIC repo, so the visibility-aware fan-out gate (#742) admits any watcher.
+    await upsertRepositoryFromGitHub(env, { name: "repo", full_name: "owner/repo", private: false, owner: { login: "owner" }, default_branch: "main" }, 100);
+    // Subscribe with non-canonical casing — the webhook delivers the canonical `repository.full_name`,
+    // so the stored repo must still match it (and be normalized for display + idempotency).
+    await upsertIssueWatchSubscription(env, { login: "alice", repoFullName: "Owner/Repo" });
+    expect((await listIssueWatchSubscriptionsForLogin(env, "alice"))[0]!.repoFullName).toBe("owner/repo");
+
+    // Delivery-side lookup uses the canonical webhook casing and still finds the watcher.
+    expect(await listIssueWatchersForRepo(env, "owner/repo")).toHaveLength(1);
+    const events = await detectIssueWatchEvents(env, "owner/repo", issue({ number: 21, authorLogin: "maintainer" }));
+    expect(events.map((e) => e.recipientLogin)).toEqual(["alice"]);
+
+    // Re-subscribing under yet another casing is idempotent (no duplicate row), and unwatch is case-insensitive.
+    await upsertIssueWatchSubscription(env, { login: "alice", repoFullName: "OWNER/REPO", labels: ["bug"] });
+    expect(await listIssueWatchSubscriptionsForLogin(env, "alice")).toHaveLength(1);
+    expect(await deleteIssueWatchSubscription(env, "alice", "owner/REPO")).toBe(true);
+    expect(await listIssueWatchersForRepo(env, "owner/repo")).toHaveLength(0);
+  });
 });
 
 describe("detectIssueWatchEvents", () => {