Fix repo update choking on duplicated parents

.sqlx/query-2af3e5b2458b2674034853428f264190c2c1614d8df8dd831fd668c121786e88.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "INSERT OR IGNORE INTO commit_links (parent, child) VALUES (?, ?)",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "2af3e5b2458b2674034853428f264190c2c1614d8df8dd831fd668c121786e88"
+}

.sqlx/query-99a988f87d9e1d9ca6b818d815bc343b1e65e9aa00751f1a530dfc696a94c6dd.json

@@ -1,12 +0,0 @@
-{
-  "db_name": "SQLite",
-  "query": "INSERT INTO commit_links (parent, child) VALUES (?, ?)",
-  "describe": {
-    "columns": [],
-    "parameters": {
-      "Right": 2
-    },
-    "nullable": []
-  },
-  "hash": "99a988f87d9e1d9ca6b818d815bc343b1e65e9aa00751f1a530dfc696a94c6dd"
-}

src/update.rs

@@ -97,8 +97,10 @@ async fn insert_new_commit_links(conn: &mut SqliteConnection, new: &[Info]) -> a
         let child = commit.id.to_string();
         for parent in &commit.parent_ids {
             let parent = parent.to_string();
+            // Commits *cough*linuxkernel*cough* may list the same parent
+            // multiple times, so we just ignore duplicates during insert.
             sqlx::query!(
-                "INSERT INTO commit_links (parent, child) VALUES (?, ?)",
+                "INSERT OR IGNORE INTO commit_links (parent, child) VALUES (?, ?)",
                 parent,
                 child
             )