small cleanup of comments/added optional impersonate into run_bounded_cycle for monitors like bhphoto that need different clients than what we support/dont need to rotate

src/monitor_utils/sessions.py

@@ -13,6 +13,7 @@ import random
 from aioproxies import AioProxies
 from aioweb import Response
 from aioweb_tls import CurlCffi, TLSSession
+from curl_cffi.requests.impersonate import BrowserTypeLiteral
 from monitor_utils.constants import (
     CLIENT_IDENTIFIERS,
     MAX_CURL_HANDLES,
@@ -70,6 +71,7 @@ def get_default_session(
     headers: dict | None = None,
     timeout: int = TIMEOUT_SECONDS,
     max_clients: int = MAX_CURL_HANDLES,
+    impersonate: BrowserTypeLiteral | None = None,
 ) -> TLSSession:
     """Return a TLSSession impersonating a random client fingerprint.
 
@@ -98,13 +100,17 @@ def get_default_session(
             checkout. Keep it at or above the monitor's real fan-out (the sum
             of its pagination semaphores plus any unsemaphored per-cycle
             requests) so the wait is never reachable.
+        impersonate: A curl_cffi profile to pin instead of drawing one from
+            CLIENT_IDENTIFIERS, for a retailer whose bot protection only
+            tolerates some profiles from a given IP (B&H's Cloudflare refuses
+            every chrome profile on a flagged IP but still accepts safari).
 
     Returns:
         A BoundedCloseSession (a TLSSession whose close is bounded) over a
         curl_cffi backend with a random impersonation, with the proxy pool
         attached as proxy_pool.
     """
-    impersonate = random.choice(CLIENT_IDENTIFIERS)
+    impersonate = impersonate or random.choice(CLIENT_IDENTIFIERS)
     session = BoundedCloseSession(
         backend=CurlCffi(impersonate=impersonate),
         headers=headers,