Fix foreign key error when adding runs

.sqlx/query-a9cafe3a6ef8bcba95b1b29d5b9bde81f8233804e771b6347a5d165663a39680.json

@@ -0,0 +1,12 @@
+{
+  "db_name": "SQLite",
+  "query": "\n            INSERT OR REPLACE INTO metrics (name, unit)\n            VALUES (?, ?)\n            ",
+  "describe": {
+    "columns": [],
+    "parameters": {
+      "Right": 2
+    },
+    "nullable": []
+  },
+  "hash": "a9cafe3a6ef8bcba95b1b29d5b9bde81f8233804e771b6347a5d165663a39680"
+}

migrations/20240513132200_init.sql

@@ -38,7 +38,7 @@ CREATE TABLE refs (
 CREATE TABLE metrics (
     name      TEXT NOT NULL PRIMARY KEY,
     unit      TEXT,
-    direction INT
+    direction INT  NOT NULL DEFAULT 0
 ) STRICT;
 
 CREATE TABLE runs (

src/server/web/api/worker.rs

@@ -78,6 +78,17 @@ async fn save_work(
         .await?;
 
     for (metric, measurement) in run.measurements {
+        sqlx::query!(
+            "
+            INSERT OR REPLACE INTO metrics (name, unit)
+            VALUES (?, ?)
+            ",
+            metric,
+            measurement.unit,
+        )
+        .execute(&mut *conn)
+        .await?;
+
         sqlx::query!(
             "
             INSERT INTO run_measurements (