diff --git a/src/provider_state.py b/src/provider_state.py
index c1302b22..d988f3de 100644
--- a/src/provider_state.py
+++ b/src/provider_state.py
@@ -22,11 +22,10 @@ from dataclasses import dataclass, field
 from src.type_aliases import HistoryMessage, Metadata
 
 
-@dataclass
 @dataclass
 class ProviderHistory:
  messages: list[HistoryMessage] = field(default_factory=list)
- lock: threading.Lock = field(default_factory=threading.Lock)
+ lock: threading.RLock = field(default_factory=threading.RLock)
 
  def __bool__(self) -> bool:
   with self.lock:
@@ -71,16 +70,6 @@ _PROVIDER_HISTORIES: dict[str, ProviderHistory] = {
 }
 
 
-_PROVIDER_HISTORIES: dict[str, ProviderHistory] = {
- "anthropic": ProviderHistory(),
- "deepseek": ProviderHistory(),
- "minimax": ProviderHistory(),
- "qwen": ProviderHistory(),
- "grok": ProviderHistory(),
- "llama": ProviderHistory(),
-}
-
-
 def get_history(provider: str) -> ProviderHistory:
  if provider not in _PROVIDER_HISTORIES:
   raise KeyError(f"Unknown provider: {provider!r}")