fix: concurrent connection write-write conflict

fixes the following when running in dbt:
```
10:25:54    Database Error in seed statementline_current (seeds/fixtures/statementline_current.csv)
  TransactionContext Error: Catalog write-write conflict on alter with "Table\0main\0_fs_users_ext\0Schema\0main\0main"
```

fakesnow/__init__.py

@@ -13,6 +13,7 @@
 import snowflake.connector.pandas_tools
 
 import fakesnow.fakes as fakes
+from fakesnow.global_database import create_global_database
 
 
 @contextmanager
@@ -52,6 +53,7 @@ def patch(
     assert not isinstance(snowflake.connector.connect, mock.MagicMock), "Snowflake connector is already patched"
 
     duck_conn = duckdb.connect(database=":memory:")
+    create_global_database(duck_conn)
 
     fake_fns = {
         # every time we connect, create a new cursor (ie: connection) so we can isolate each connection's

fakesnow/fakes.py

@@ -32,7 +32,6 @@
 import fakesnow.info_schema as info_schema
 import fakesnow.macros as macros
 import fakesnow.transforms as transforms
-from fakesnow.global_database import create_global_database
 from fakesnow.variables import Variables
 
 SCHEMA_UNSET = "schema_unset"
@@ -533,8 +532,6 @@ def __init__(
         self._paramstyle = snowflake.connector.paramstyle
         self.variables = Variables()
 
-        create_global_database(duck_conn)
-
         # create database if needed
         if (
             create_database

tests/test_connect.py

@@ -1,6 +1,7 @@
-
 from __future__ import annotations
 
+import concurrent.futures
+
 # ruff: noqa: E501
 # pyright: reportOptionalMemberAccess=false
 import tempfile
@@ -43,11 +44,25 @@ def test_connect_different_sessions_use_database(_fakesnow_no_auto_create: None)
         assert cur.fetchall() == [(1, "Jenny", "P"), (2, "Jasper", "M")]
 
 
+def test_connect_concurrently(_fakesnow: None) -> None:
+    with concurrent.futures.ThreadPoolExecutor(max_workers=2) as executor:
+        future_a = executor.submit(snowflake.connector.connect)
+        future_b = executor.submit(snowflake.connector.connect)
+
+        futures = [future_a, future_b]
+
+        for future in concurrent.futures.as_completed(futures):
+            # exceptions if any will be raised here. we want to avoid
+            # duckdb.duckdb.TransactionException: TransactionContext Error: Catalog write-write conflict
+            _ = future.result()
+
+
 def test_connect_db_path_can_create_database() -> None:
     with tempfile.TemporaryDirectory(prefix="fakesnow-test") as db_path, fakesnow.patch(db_path=db_path):
         cursor = snowflake.connector.connect().cursor()
         cursor.execute("CREATE DATABASE db2")
 
+
 def test_connect_db_path_reuse():
     with tempfile.TemporaryDirectory(prefix="fakesnow-test") as db_path:
         with (
@@ -68,8 +83,6 @@ def test_connect_db_path_reuse():
             assert cur.execute("select * from example").fetchall() == [(420,)]
 
 
-
-
 def test_connect_without_database(_fakesnow_no_auto_create: None):
     with snowflake.connector.connect() as conn, conn.cursor() as cur:
         with pytest.raises(snowflake.connector.errors.ProgrammingError) as excinfo:
@@ -154,7 +167,6 @@ def test_connect_without_schema(_fakesnow: None):
         assert conn.schema == "SCHEMA1"
 
 
-
 def test_connect_with_non_existent_db_or_schema(_fakesnow_no_auto_create: None):
     # can connect with db that doesn't exist
     with snowflake.connector.connect(database="marts") as conn, conn.cursor() as cur: