fix: resolve 500 errors on /activity and /changelog

- Activity feed: use schema modules instead of string table names in Ecto
  queries to fix UUID encoding (Postgrex expected binary, got string)
- Changelog parser: remove plain hyphen from separator character class
  to prevent splitting on date hyphens (2026-02-13)

lib/towerops/activity_feed.ex

@@ -13,6 +13,12 @@ defmodule Towerops.ActivityFeed do
 
   import Ecto.Query
 
+  alias Towerops.Alerts.Alert
+  alias Towerops.ConfigChanges.ConfigChangeEvent
+  alias Towerops.Devices.Device
+  alias Towerops.Devices.Event, as: DeviceEvent
+  alias Towerops.Preseem.SyncLog
+  alias Towerops.Sites.Site
   alias Towerops.Repo
 
   @type activity_item :: %{
@@ -109,10 +115,10 @@ defmodule Towerops.ActivityFeed do
 
   defp fetch_source(:config_change, org_id, after_dt, before_dt, limit) do
     query =
-      from(c in "config_change_events",
-        join: d in "devices",
+      from(c in ConfigChangeEvent,
+        join: d in Device,
         on: d.id == c.device_id,
-        left_join: s in "sites",
+        left_join: s in Site,
         on: s.id == d.site_id,
         where: c.organization_id == ^org_id,
         select: %{
@@ -155,10 +161,10 @@ defmodule Towerops.ActivityFeed do
 
   defp fetch_source(:alert_fired, org_id, after_dt, before_dt, limit) do
     query =
-      from(a in "alerts",
-        join: d in "devices",
+      from(a in Alert,
+        join: d in Device,
         on: d.id == a.device_id,
-        left_join: s in "sites",
+        left_join: s in Site,
         on: s.id == d.site_id,
         where: d.organization_id == ^org_id,
         where: a.alert_type == "device_down",
@@ -201,10 +207,10 @@ defmodule Towerops.ActivityFeed do
 
   defp fetch_source(:alert_resolved, org_id, after_dt, before_dt, limit) do
     query =
-      from(a in "alerts",
-        join: d in "devices",
+      from(a in Alert,
+        join: d in Device,
         on: d.id == a.device_id,
-        left_join: s in "sites",
+        left_join: s in Site,
         on: s.id == d.site_id,
         where: d.organization_id == ^org_id,
         where: not is_nil(a.resolved_at),
@@ -247,10 +253,10 @@ defmodule Towerops.ActivityFeed do
 
   defp fetch_source(:device_event, org_id, after_dt, before_dt, limit) do
     query =
-      from(e in "device_events",
-        join: d in "devices",
+      from(e in DeviceEvent,
+        join: d in Device,
         on: d.id == e.device_id,
-        left_join: s in "sites",
+        left_join: s in Site,
         on: s.id == d.site_id,
         where: d.organization_id == ^org_id,
         select: %{
@@ -291,7 +297,7 @@ defmodule Towerops.ActivityFeed do
 
   defp fetch_source(:sync, org_id, after_dt, before_dt, limit) do
     query =
-      from(sl in "preseem_sync_logs",
+      from(sl in SyncLog,
         where: sl.organization_id == ^org_id,
         select: %{
           id: sl.id,
@@ -331,8 +337,8 @@ defmodule Towerops.ActivityFeed do
 
   defp fetch_source(:device_added, org_id, after_dt, before_dt, limit) do
     query =
-      from(d in "devices",
-        left_join: s in "sites",
+      from(d in Device,
+        left_join: s in Site,
         on: s.id == d.site_id,
         where: d.organization_id == ^org_id,
         select: %{

lib/towerops_web/changelog_parser.ex

@@ -17,8 +17,9 @@ defmodule ToweropsWeb.ChangelogParser do
     |> Enum.reduce([], fn line, acc ->
       cond do
         # Date header with title: "2026-02-13 — Title"
-        Regex.match?(~r/^\d{4}-\d{2}-\d{2}\s*[—–-]\s*.+/, line) ->
-          [date_str, title] = String.split(line, ~r/\s*[—–-]\s*/, parts: 2)
+        Regex.match?(~r/^\d{4}-\d{2}-\d{2}\s+[—–]\s+.+/, line) ->
+          [date_str | rest] = String.split(line, ~r/\s+[—–]\s+/, parts: 2)
+          title = List.first(rest, "")
           entry = %{date: Date.from_iso8601!(String.trim(date_str)), title: String.trim(title), items: []}
           [entry | acc]