fix(events): bound provider prefix recent query

apps/api/src/services/platform_operator_service.py

@@ -7310,6 +7310,23 @@ async def get_run_detail(
 # Channel Events
 # =============================================================================
 
+
+def _exclusive_text_prefix_upper_bound(prefix: str) -> str:
+    if not prefix:
+        return ""
+    last = ord(prefix[-1])
+    if last >= 0x10FFFF:
+        return ""
+    return f"{prefix[:-1]}{chr(last + 1)}"
+
+
+def _provider_event_id_prefix_bounds(provider_prefix: str) -> tuple[str, str]:
+    prefix = provider_prefix.strip().lower()
+    if prefix and ":" not in prefix:
+        prefix = f"{prefix}:"
+    return prefix, _exclusive_text_prefix_upper_bound(prefix)
+
+
 async def list_recent_channel_events(
     *,
     project_id: str | None,
@@ -7332,23 +7349,17 @@ async def list_recent_channel_events(
         if channel_type is not None:
             stmt = stmt.where(AwoooPConversationEvent.channel_type == channel_type)
         if recent_provider_prefix is not None:
-            if ":" in recent_provider_prefix:
+            prefix_lower, prefix_upper = _provider_event_id_prefix_bounds(
+                recent_provider_prefix
+            )
+            if prefix_lower:
                 stmt = stmt.where(
-                    AwoooPConversationEvent.provider_event_id.like(
-                        f"{provider_prefix.strip()}%"
-                    )
+                    AwoooPConversationEvent.provider_event_id >= prefix_lower
                 )
-            else:
-                stmt = stmt.where(
-                    text(
-                        "LOWER(COALESCE("
-                        "NULLIF(source_envelope->>'provider', ''), "
-                        "NULLIF(split_part(provider_event_id, ':', 1), ''), "
-                        "channel_type"
-                        ")) = :recent_provider_prefix"
+                if prefix_upper:
+                    stmt = stmt.where(
+                        AwoooPConversationEvent.provider_event_id < prefix_upper
                     )
-                )
-                stmt = stmt.params(recent_provider_prefix=recent_provider_prefix)
             stmt = stmt.order_by(
                 AwoooPConversationEvent.received_at.desc(),
                 AwoooPConversationEvent.event_id.desc(),