Add README, fix column deduplication in parser, remove .env from git

tests/test_config.py

@@ -0,0 +1,54 @@
+import importlib
+
+import pytest
+
+import sqlmem.config as cfg
+
+
+def _reload(monkeypatch, **env_vars):
+    for key in ("SQLMEM_DEBUG", "SQLMEM_CACHE_DB", "SQLMEM_BACKUP_INTERVAL"):
+        monkeypatch.delenv(key, raising=False)
+    for key, val in env_vars.items():
+        monkeypatch.setenv(key, val)
+    importlib.reload(cfg)
+
+
+def test_debug_defaults_to_false(monkeypatch):
+    _reload(monkeypatch)
+    assert cfg.DEBUG is False
+
+
+def test_debug_true(monkeypatch):
+    _reload(monkeypatch, SQLMEM_DEBUG="true")
+    assert cfg.DEBUG is True
+
+
+def test_debug_case_insensitive(monkeypatch):
+    _reload(monkeypatch, SQLMEM_DEBUG="TRUE")
+    assert cfg.DEBUG is True
+
+
+def test_debug_explicit_false(monkeypatch):
+    _reload(monkeypatch, SQLMEM_DEBUG="false")
+    assert cfg.DEBUG is False
+
+
+def test_cache_db_default_name(monkeypatch):
+    _reload(monkeypatch)
+    assert cfg.CACHE_DB_PATH.name == "cache.db"
+
+
+def test_cache_db_custom_path(monkeypatch, tmp_path):
+    custom = str(tmp_path / "my_cache.db")
+    _reload(monkeypatch, SQLMEM_CACHE_DB=custom)
+    assert cfg.CACHE_DB_PATH == tmp_path / "my_cache.db"
+
+
+def test_backup_interval_default(monkeypatch):
+    _reload(monkeypatch)
+    assert cfg.BACKUP_INTERVAL_SECONDS == 3600
+
+
+def test_backup_interval_custom(monkeypatch):
+    _reload(monkeypatch, SQLMEM_BACKUP_INTERVAL="7200")
+    assert cfg.BACKUP_INTERVAL_SECONDS == 7200