feat(vector): add direct pgvector adapter

harness/tests/test_adapter_factory.py

@@ -1,7 +1,7 @@
 import pytest
 
 from tht.adapters.dwh import PostgresDwhAdapter, ThothRestDwhAdapter
-from tht.adapters.vector import LegacyDirectVectorStore, ThothHttpVectorStore
+from tht.adapters.vector import PgVectorStore, ThothHttpVectorStore
 from tht.adapters.factory import build_dwh, build_vector_store
 from tht.config import Config, ConfigError
 
@@ -28,7 +28,11 @@ def _config(*, dwh_type="thoth_rest", vector_type="thoth_vector_http", reader=Tr
     vectors = (
         {
             "type": "thoth_vector_http",
-            **({"reader": {"base_url": "https://vectors.test/", "api_key": "reader"}} if reader else {}),
+            **(
+                {"reader": {"base_url": "https://vectors.test/", "api_key": "reader"}}
+                if reader
+                else {}
+            ),
             **(
                 {"writer": {"base_url": "https://vectors.test/", "api_key": "writer"}}
                 if writer
@@ -38,13 +42,32 @@ def _config(*, dwh_type="thoth_rest", vector_type="thoth_vector_http", reader=Tr
         if vector_type == "thoth_vector_http"
         else {
             "type": "pgvector_direct",
-            "connection": {
-                "host": "vector-db",
-                "database": "postgres",
-                "schema": "vectors",
-                "user": "reader",
-                "password": "secret",
-            },
+            **(
+                {
+                    "reader": {
+                        "host": "vector-db",
+                        "database": "postgres",
+                        "schema": "vectors",
+                        "user": "reader",
+                        "password": "secret",
+                    }
+                }
+                if reader
+                else {}
+            ),
+            **(
+                {
+                    "writer": {
+                        "host": "vector-db",
+                        "database": "postgres",
+                        "schema": "vectors",
+                        "user": "writer",
+                        "password": "secret",
+                    }
+                }
+                if writer
+                else {}
+            ),
         }
     )
     legacy_database = (
@@ -57,9 +80,7 @@ def _config(*, dwh_type="thoth_rest", vector_type="thoth_vector_http", reader=Tr
             "transport": "rest",
         }
     )
-    return Config.model_validate(
-        {"dwh": dwh, "vectors": vectors, "database": legacy_database}
-    )
+    return Config.model_validate({"dwh": dwh, "vectors": vectors, "database": legacy_database})
 
 
 @pytest.mark.parametrize(
@@ -87,14 +108,23 @@ def test_factory_builds_writer_only_http_vector_when_write_is_required():
     assert store.capabilities.upsert is True
 
 
-def test_factory_selects_direct_vector_reader():
-    config = _config(vector_type="pgvector_direct")
+def test_factory_selects_direct_vector_store_and_requires_writer():
+    config = _config(vector_type="pgvector_direct", writer=False)
 
-    assert isinstance(build_vector_store(config), LegacyDirectVectorStore)
+    assert isinstance(build_vector_store(config), PgVectorStore)
     with pytest.raises(ConfigError, match="writer"):
         build_vector_store(config, require_write=True)
 
 
+def test_factory_builds_writer_only_direct_vector_when_write_is_required():
+    store = build_vector_store(
+        _config(vector_type="pgvector_direct", reader=False), require_write=True
+    )
+    assert isinstance(store, PgVectorStore)
+    assert store.capabilities.search is False
+    assert store.capabilities.upsert is True
+
+
 def test_factory_propagates_non_default_statement_timeout():
     config = _config(dwh_type="postgres_direct")
     config.execution.statement_timeout_ms = 12_345