Add enterprise appliance experience Phase 1 foundation

tests/backend/test_operations.py

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+import sqlite3
+
+from ._source import load_symbols
+
+
+def test_operation_states_include_recovery_and_terminal_states():
+    ns = load_symbols("OPERATION_STATES", "TERMINAL_OPERATION_STATES")
+    assert {"requested", "running", "awaiting_reboot", "recovery_required"} <= ns["OPERATION_STATES"]
+    assert ns["TERMINAL_OPERATION_STATES"] <= ns["OPERATION_STATES"]
+
+
+def test_operation_schema_prevents_duplicate_kind_and_idempotency_key():
+    ns = load_symbols("SCHEMA_VERSION", "_column_names", "run_migrations")
+    db = sqlite3.connect(":memory:")
+    db.execute("CREATE TABLE audit_log (id INTEGER PRIMARY KEY, detail TEXT)")
+    ns["run_migrations"](db)
+    values = ("1", "c1", "install", "requested", "now", "now", "same")
+    sql = "INSERT INTO operations (id,correlation_id,kind,state,requested_at,updated_at,idempotency_key) VALUES (?,?,?,?,?,?,?)"
+    db.execute(sql, values)
+    try:
+        db.execute(sql, ("2", "c2", "install", "requested", "now", "now", "same"))
+    except sqlite3.IntegrityError:
+        pass
+    else:
+        raise AssertionError("duplicate idempotent operation accepted")