Endpoint telemetry, PC Detail rework and a checked backup/restore path

plugins/endpoints/migrations/versions/0016_endpoint_dellupdates.py

@@ -0,0 +1,51 @@
+"""Add dellupdatesjson to endpointstates.
+
+Stores the pending Dell Command | Update summary reported by the
+shopdb-dellupdates agent utility. MEDIUMTEXT for consistency with the other
+snapshot columns on this table.
+
+Nullable with no backfill. Null means the endpoint has never reported a Dell
+scan result, which is deliberately distinct from a stored payload whose status
+is 'ok' with an empty list (scanned, nothing pending). The status card renders
+those two states differently, so defaulting this to an empty summary would
+assert every pre-existing endpoint had been scanned and found clean.
+
+Idempotent: the column-add checks the live schema first, so a re-run and a
+db.create_all() site both stay clean on strict MySQL 8.
+"""
+from alembic import op
+
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'endpoints0016dellupdates'
+down_revision = 'endpoints0015systemtelemetry'
+branch_labels = None
+depends_on = None
+
+TABLE_NAME = 'endpointstates'
+
+COLUMN_NAME = 'dellupdatesjson'
+
+
+def _has_column(table_name, column_name):
+    from sqlalchemy import inspect
+
+    inspector = inspect(op.get_bind())
+    if not inspector.has_table(table_name):
+        return False
+    return any(col['name'] == column_name
+               for col in inspector.get_columns(table_name))
+
+
+def upgrade():
+    if not _has_column(TABLE_NAME, COLUMN_NAME):
+        op.add_column(
+            TABLE_NAME,
+            sa.Column(COLUMN_NAME, sa.Text(length=16777215), nullable=True))
+
+
+def downgrade():
+    if _has_column(TABLE_NAME, COLUMN_NAME):
+        op.drop_column(TABLE_NAME, COLUMN_NAME)