fix: increase TimescaleDB tuple decompression limit to unlimited

Fixes ERROR 53400 (configuration_limit_exceeded) during large interface
sync operations in device discovery.

The sync_interfaces operation was decompressing 146,603 tuples but the
default limit was 100,000. Setting to 0 (unlimited) removes this constraint.

Error occurred in: Towerops.Snmp.Discovery.sync_interfaces/2

priv/repo/migrations/20260304234205_increase_timescaledb_decompression_limit.exs

@@ -0,0 +1,20 @@
+defmodule Towerops.Repo.Migrations.IncreaseTimescaledbDecompressionLimit do
+  use Ecto.Migration
+
+  def up do
+    # Increase TimescaleDB tuple decompression limit to unlimited (0)
+    # This is needed for large interface sync operations during device discovery
+    # that can touch 100k+ compressed tuples in a single transaction
+    execute "ALTER DATABASE #{db_name()} SET timescaledb.max_tuples_decompressed_per_dml_transaction = 0"
+  end
+
+  def down do
+    # Restore default limit of 100,000
+    execute "ALTER DATABASE #{db_name()} SET timescaledb.max_tuples_decompressed_per_dml_transaction = 100000"
+  end
+
+  defp db_name do
+    config = Application.get_env(:towerops, Towerops.Repo)
+    config[:database] || "towerops_dev"
+  end
+end