Add projects

backend/internal/home/testdata/concurrency_dispatch_accounted.json

@@ -0,0 +1,27 @@
+{
+  "model": "gpt",
+  "provider": "codex",
+  "auth_index": "cred-1",
+  "user_api_key": "user-key",
+  "auth": {
+    "id": "cred-1",
+    "provider": "codex",
+    "status": "active",
+    "disabled": false,
+    "unavailable": false,
+    "quota": {
+      "exceeded": false,
+      "next_recover_at": "0001-01-01T00:00:00Z"
+    },
+    "created_at": "0001-01-01T00:00:00Z",
+    "updated_at": "0001-01-01T00:00:00Z",
+    "last_refreshed_at": "0001-01-01T00:00:00Z",
+    "next_refresh_after": "0001-01-01T00:00:00Z",
+    "next_retry_after": "0001-01-01T00:00:00Z"
+  },
+  "concurrency": {
+    "accounted": true,
+    "credential_id": "cred-1",
+    "model": "gpt"
+  }
+}

backend/internal/home/testdata/concurrency_dispatch_busy.json

@@ -0,0 +1,8 @@
+{
+  "error": {
+    "type": "credential_concurrency_exceeded",
+    "message": "credential concurrency limit reached",
+    "retryable": true,
+    "retry_after_ms": 750
+  }
+}

backend/internal/home/testdata/concurrency_release.json

@@ -0,0 +1 @@
+{"credential_id":"cred-1","model":"gpt","release_seq":1}

backend/internal/home/testdata/credential_in_flight_contract.json

@@ -0,0 +1,52 @@
+{
+  "config": {
+    "snapshot-interval": "2s",
+    "stale-after": "10s",
+    "max-part-bytes": 262144,
+    "max-part-count": 64,
+    "max-revision-bytes": 16777216,
+    "max-aggregate-groups": 100000,
+    "max-details": 10000,
+    "max-string-bytes": 256,
+    "staging-retention": "1m"
+  },
+  "part": {
+    "kind": "part",
+    "revision": 7,
+    "observed_at": "2026-07-21T12:00:00Z",
+    "barrier_revision": 11,
+    "part_index": 0,
+    "part_count": 1,
+    "details_truncated": false,
+    "aggregates": [
+      {
+        "credential_id": "cred-a",
+        "model": "gpt-5",
+        "status": "accounted",
+        "count": 2
+      },
+      {
+        "credential_id": "cred-a",
+        "model": "gpt-5",
+        "status": "unaccounted",
+        "count": 1
+      }
+    ],
+    "details": [
+      {
+        "request_id": "req-1",
+        "credential_id": "cred-a",
+        "model": "gpt-5",
+        "request_kind": "sse",
+        "started_at": "2026-07-21T11:59:58Z"
+      }
+    ]
+  },
+  "overflow": {
+    "kind": "overflow",
+    "revision": 8,
+    "observed_at": "2026-07-21T12:00:02Z",
+    "barrier_revision": 12,
+    "aggregate_group_count": 100001
+  }
+}