fix: add workspace user turn repair utility

tests/test_repair_workspace_user_turns.py

@@ -0,0 +1,91 @@
+import importlib.util
+import json
+import sqlite3
+from pathlib import Path
+
+
+SCRIPT = Path(__file__).resolve().parents[1] / "scripts" / "repair_workspace_user_turns.py"
+spec = importlib.util.spec_from_file_location("repair_workspace_user_turns", SCRIPT)
+repair = importlib.util.module_from_spec(spec)
+spec.loader.exec_module(repair)
+
+
+def test_clean_message_list_strips_workspace_prefix_and_dedupes_adjacent_user_turns():
+    cleaned, stats = repair.clean_message_list([
+        {"role": "user", "content": "Ok, mache weiter"},
+        {"role": "user", "content": "[Workspace: /tmp/project]\nOk, mache weiter"},
+        {"role": "assistant", "content": "continuing"},
+        {"role": "user", "content": "[Workspace: /tmp/project]\nNext"},
+    ])
+
+    assert stats == {"stripped_workspace_prefixes": 2, "removed_adjacent_user_duplicates": 1}
+    assert [m["role"] for m in cleaned] == ["user", "assistant", "user"]
+    assert [m["content"] for m in cleaned] == ["Ok, mache weiter", "continuing", "Next"]
+
+
+def test_repair_sidecars_writes_backup_and_updates_message_count(tmp_path):
+    sessions_dir = tmp_path / "sessions"
+    backup_dir = tmp_path / "backup"
+    sessions_dir.mkdir()
+    sidecar = sessions_dir / "abc.json"
+    sidecar.write_text(json.dumps({
+        "session_id": "abc",
+        "message_count": 3,
+        "messages": [
+            {"role": "user", "content": "ping"},
+            {"role": "user", "content": "[Workspace: /tmp]\nping"},
+            {"role": "assistant", "content": "pong"},
+        ],
+    }), encoding="utf-8")
+
+    report = repair.repair_sidecars(sessions_dir, backup_dir=backup_dir, dry_run=False)
+
+    assert report["changed_sidecars"][0]["removed_adjacent_user_duplicates"] == 1
+    updated = json.loads(sidecar.read_text(encoding="utf-8"))
+    assert updated["message_count"] == 2
+    assert [m["content"] for m in updated["messages"]] == ["ping", "pong"]
+    assert (backup_dir / "abc.json").exists()
+
+
+def test_repair_state_db_strips_prefixes_deletes_duplicates_and_updates_counts(tmp_path):
+    db = tmp_path / "state.db"
+    con = sqlite3.connect(db)
+    con.executescript("""
+        create table sessions (
+            id text primary key,
+            message_count integer default 0,
+            tool_call_count integer default 0
+        );
+        create table messages (
+            id integer primary key autoincrement,
+            session_id text not null,
+            role text not null,
+            content text,
+            tool_name text
+        );
+    """)
+    con.execute("insert into sessions(id, message_count, tool_call_count) values ('s1', 4, 1)")
+    con.executemany(
+        "insert into messages(session_id, role, content, tool_name) values (?, ?, ?, ?)",
+        [
+            ("s1", "user", "hello", None),
+            ("s1", "user", "[Workspace: /tmp]\nhello", None),
+            ("s1", "assistant", "hi", None),
+            ("s1", "tool", "{}", "read_file"),
+        ],
+    )
+    con.commit()
+    con.close()
+
+    report = repair.repair_state_db(db, backup_dir=tmp_path / "backup", dry_run=False)
+
+    assert report["updated_workspace_prefix_user_messages"] == 1
+    assert report["removed_adjacent_user_duplicates"] == 1
+    con = sqlite3.connect(db)
+    assert con.execute("select message_count, tool_call_count from sessions where id = 's1'").fetchone() == (3, 1)
+    assert con.execute("select role, content from messages order by id").fetchall() == [
+        ("user", "hello"),
+        ("assistant", "hi"),
+        ("tool", "{}"),
+    ]
+    con.close()