fixed a small database issue with price drop tracking and added doc strings

src/monitor_utils/sessions.py

@@ -1,4 +1,9 @@
-# ik ua/tls doesn't match headers/header order but targeted antibots don't seem to care might fix later
+"""Shared HTTP session helpers for all monitors.
+
+Known gap: UA/TLS fingerprint does not always match headers/header order,
+but targeted antibots do not currently seem to care.
+"""
+
 import asyncio
 import json
 import logging
@@ -42,6 +47,22 @@ async def get_base_session(
     timeout: aiohttp.ClientTimeout = CLIENT_TIMEOUT,
     proxies: AioProxies | None = None,
 ) -> AsyncGenerator[aiohttp.ClientSession, None]:
+    """Yield an aiohttp session with a random User-Agent and attached proxy pool.
+
+    The proxy pool is stored on the session as proxy_pool for send_request to
+    rotate per request. The session is always closed on exit.
+
+    Args:
+        headers: Headers applied to the session; User-Agent is defaulted if
+            absent.
+        cookies: Cookies applied to the session.
+        connector: Optional TCP connector.
+        timeout: Client timeout applied to the session.
+        proxies: Proxy pool attached to the session.
+
+    Yields:
+        The configured aiohttp session.
+    """
     headers = headers if headers else {}
     headers.setdefault("User-Agent", UA.random)
     session = aiohttp.ClientSession(
@@ -60,6 +81,20 @@ async def get_tls_session(
     timeout: int = TIMEOUT_SECONDS,
     proxies: AioProxies | None = None,
 ) -> AsyncGenerator[AsyncSession, None]:
+    """Yield a curl_cffi session impersonating a random client fingerprint.
+
+    The proxy pool is stored on the session as proxy_pool for send_request to
+    rotate per request.
+
+    Args:
+        headers: Headers applied to the session; a Chrome User-Agent is
+            defaulted if absent.
+        timeout: Request timeout in seconds.
+        proxies: Proxy pool attached to the session.
+
+    Yields:
+        The configured curl_cffi session.
+    """
     headers = headers if headers else {}
     headers.setdefault("User-Agent", UA.chrome)
     async with AsyncSession(
@@ -74,6 +109,12 @@ async def get_tls_session(
 def build_session_details(
     session: aiohttp.ClientSession | AsyncSession, headers: dict = None
 ):
+    """Merge headers into an existing session, defaulting a random User-Agent.
+
+    Args:
+        session: Session whose headers are updated in place.
+        headers: Headers to merge; User-Agent is defaulted if absent.
+    """
     headers = headers or {}
     headers.setdefault("User-Agent", UA.random)
     session.headers.update(headers)
@@ -105,6 +146,34 @@ async def send_request(
     reraise_json_error: bool = False,
     development_proxy: str | None = None,
 ) -> dict | str:
+    """Send a request through either session type with retries and proxy rotation.
+
+    Retries transport errors and timeouts up to RETRY_LIMIT with a fixed wait.
+    When development_proxy is set it overrides the session's proxy pool and
+    disables TLS verification for local traffic inspection; otherwise the next
+    proxy is drawn from the session's proxy_pool when present. Responses are
+    parsed as JSON when possible.
+
+    Args:
+        session: aiohttp or curl_cffi session to send through.
+        url: Request URL.
+        method: HTTP method.
+        params: Query parameters.
+        json_data: JSON body.
+        data: Form body.
+        reraise_json_error: Raise JSONDecodeError instead of returning raw
+            text when the response is not valid JSON.
+        development_proxy: Local proxy URL that overrides the pool and
+            disables verification.
+
+    Returns:
+        Parsed JSON dict, or raw response text when parsing fails and
+        reraise_json_error is False.
+
+    Raises:
+        json.JSONDecodeError: When parsing fails and reraise_json_error is
+            True.
+    """
     verify = True
     if development_proxy:
         proxy = development_proxy