Eagerly pre-load today's disk records into push_store_ref at startup

Previously load_today() was only called if in-memory records were empty,
which was never true once the first WeConnect poll had completed.
Now disk records are loaded unconditionally at startup and merged with
live in-memory records (dedup by ts) when a client connects.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

server/network.py

@@ -2,7 +2,6 @@ import json
 import logging
 import socket
 import threading
-from typing import Callable
 
 log = logging.getLogger(__name__)
 
@@ -12,18 +11,23 @@ def _accept_loop(
     clients: list,
     lock: threading.Lock,
     store_ref: dict,
-    load_today: Callable | None,
 ) -> None:
     while True:
         try:
             conn, addr = server_sock.accept()
             log.info("Push client connected from %s", addr)
             with lock:
-                store = store_ref["current"]
-                records = store["records"] if store else []
-                if not records and load_today is not None:
-                    log.info("In-memory store empty — loading today's records from disk")
-                    records = load_today()
+                store    = store_ref["current"]
+                in_mem   = store["records"] if store else []
+                preloaded = store_ref.get("preloaded", [])
+
+                if preloaded:
+                    seen_ts = {r.get("ts") for r in preloaded}
+                    extra   = [r for r in in_mem if r.get("ts") not in seen_ts]
+                    records = sorted(preloaded + extra, key=lambda r: r.get("ts", ""))
+                else:
+                    records = in_mem
+
                 try:
                     for record in records:
                         conn.sendall((json.dumps(record, default=str) + "\n").encode())
@@ -53,21 +57,17 @@ def broadcast(snapshot: dict, clients: list, lock: threading.Lock) -> None:
             log.info("Push client disconnected")
 
 
-def start_push_server(
-    host: str,
-    port: int,
-    load_today: Callable | None = None,
-) -> tuple:
+def start_push_server(host: str, port: int) -> tuple:
     server_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
     server_sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
     server_sock.bind((host, port))
     server_sock.listen()
-    clients: list = []
-    lock = threading.Lock()
-    store_ref: dict = {"current": None}
+    clients: list  = []
+    lock           = threading.Lock()
+    store_ref: dict = {"current": None, "preloaded": []}
     t = threading.Thread(
         target=_accept_loop,
-        args=(server_sock, clients, lock, store_ref, load_today),
+        args=(server_sock, clients, lock, store_ref),
         daemon=True,
     )
     t.start()