fix obstore config panic: use AWS_ env vars, fix duplicate import

obstore 0.9.x panics on store.config with config dict keys — marimo
calls store.config for the Files panel. Fix: set AWS_* env vars and
create S3Store() bare.

Also fix acodb_explorer: merge duplicate connect imports into one
cell, remove empty cell. marimo check now passes clean.

refs #81

notebooks/acodb_explorer.py

@@ -1,6 +1,6 @@
 import marimo
 
-__generated_with = "0.20.2"
+__generated_with = "0.21.1"
 app = marimo.App(width="full")
 
 
@@ -33,6 +33,7 @@ def _():
     from conf import connect
 
     connect.theme()
+    _s3 = connect.obstore()  # noqa: F841 — marimo auto-discovers in Files
 
     from nature import PALETTE  # noqa: E402 — needs theme() to add styles to path
 

src/conf/connect.py

@@ -125,22 +125,24 @@ def obstore(*, bucket: str = "lakehouse") -> Any:
 
     Creates an ``obstore.store.S3Store`` that marimo auto-discovers
     in the Files sidebar under Remote Storage.
+
+    Sets ``AWS_*`` env vars so that ``store.config`` (called by
+    marimo) doesn't panic — obstore 0.9.x crashes on config dict
+    keys but reads env vars correctly.
     """
     from obstore.store import S3Store
 
     endpoint = os.environ.get("RUSTFS_ENDPOINT", cfg.s3.endpoint)
     access_key = os.environ.get("RUSTFS_ACCESS_KEY", "")
     secret_key = os.environ.get("RUSTFS_SECRET_KEY", "")
-    return S3Store(
-        bucket,
-        config={
-            "endpoint": endpoint,
-            "access_key_id": access_key,
-            "secret_access_key": secret_key,
-            "region": "us-east-1",
-            "allow_http": "true",
-        },
-    )
+
+    os.environ.setdefault("AWS_ENDPOINT_URL", endpoint)
+    os.environ.setdefault("AWS_ACCESS_KEY_ID", access_key)
+    os.environ.setdefault("AWS_SECRET_ACCESS_KEY", secret_key)
+    os.environ.setdefault("AWS_DEFAULT_REGION", "us-east-1")
+    os.environ.setdefault("AWS_ALLOW_HTTP", "true")
+
+    return S3Store(bucket)
 
 
 def theme() -> None:

tests/conf/test_connect.py

@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import os
 import sqlite3
 from unittest.mock import MagicMock, patch
 
@@ -135,33 +136,26 @@ class TestS3:
 
 
 class TestObstore:
-    def test_creates_s3store(self):
+    def test_creates_s3store_and_sets_env(self):
         mock_store = MagicMock()
+        env = {
+            "RUSTFS_ENDPOINT": "http://test:9000",
+            "RUSTFS_ACCESS_KEY": "ak",
+            "RUSTFS_SECRET_KEY": "sk",
+        }
         with patch("conf.connect.cfg") as mock_cfg:
             mock_cfg.s3.endpoint = "http://rustfs:9000"
-            with patch.dict(
-                "os.environ",
-                {
-                    "RUSTFS_ENDPOINT": "http://test:9000",
-                    "RUSTFS_ACCESS_KEY": "ak",
-                    "RUSTFS_SECRET_KEY": "sk",
-                },
-            ):
+            with patch.dict("os.environ", env, clear=False):
                 with patch(
                     "obstore.store.S3Store", return_value=mock_store
                 ) as mock_cls:
                     result = connect.obstore(bucket="mybucket")
-                    mock_cls.assert_called_once_with(
-                        "mybucket",
-                        config={
-                            "endpoint": "http://test:9000",
-                            "access_key_id": "ak",
-                            "secret_access_key": "sk",
-                            "region": "us-east-1",
-                            "allow_http": "true",
-                        },
-                    )
+                    mock_cls.assert_called_once_with("mybucket")
                     assert result is mock_store
+                    assert os.environ["AWS_ENDPOINT_URL"] == "http://test:9000"
+                    assert os.environ["AWS_ACCESS_KEY_ID"] == "ak"
+                    assert os.environ["AWS_SECRET_ACCESS_KEY"] == "sk"
+                    assert os.environ["AWS_ALLOW_HTTP"] == "true"
 
     def test_default_bucket(self):
         mock_store = MagicMock()