test: Test with singer-sdk @ main

pyproject.toml

@@ -39,8 +39,7 @@ sqlalchemy = "2.0.36"
 sshtunnel = "0.4.0"
 
 [tool.poetry.dependencies.singer-sdk]
-version = "~=0.42.1"
-extras = ["faker"]
+git = "https://github.com/meltano/sdk.git"
 
 [tool.poetry.group.dev.dependencies]
 faker = ">=18.5.1"
@@ -56,7 +55,7 @@ types-jsonschema = ">=4.19.0.3"
 types-psycopg2 = ">=2.9.21.20240118"
 
 [tool.poetry.dev-dependencies.singer-sdk]
-version = "*"
+git = "https://github.com/meltano/sdk.git"
 extras = ["testing"]
 
 [tool.mypy]

tap_postgres/client.py

@@ -30,7 +30,6 @@
     from collections.abc import Iterable, Mapping
 
     from singer_sdk.helpers.types import Context
-    from sqlalchemy.dialects import postgresql
     from sqlalchemy.engine import Engine
     from sqlalchemy.engine.reflection import Inspector
 
@@ -44,7 +43,24 @@ def __init__(self, dates_as_string: bool, json_as_object: bool, *args, **kwargs)
         self.dates_as_string = dates_as_string
         self.json_as_object = json_as_object
 
-    @SQLToJSONSchema.to_jsonschema.register  # type: ignore[attr-defined]
+    @classmethod
+    def from_config(cls, config: dict) -> PostgresSQLToJSONSchema:
+        """Instantiate the SQL to JSON Schema converter from a config dictionary."""
+        SQLToJSONSchema.from_config(config)
+        return cls(
+            dates_as_string=config["dates_as_string"],
+            json_as_object=config["json_as_object"],
+        )
+
+    @functools.singledispatchmethod
+    def to_jsonschema(self, column_type: Any) -> dict:
+        """Override the default mapping for NUMERIC columns.
+
+        For example, a scale of 4 translates to a multipleOf 0.0001.
+        """
+        return super().to_jsonschema(column_type)
+
+    @to_jsonschema.register  # type: ignore[attr-defined]
     def array_to_jsonschema(self, column_type: postgresql.ARRAY) -> dict:
         """Override the default mapping for NUMERIC columns.
 
@@ -55,21 +71,21 @@ def array_to_jsonschema(self, column_type: postgresql.ARRAY) -> dict:
             "items": self.to_jsonschema(column_type.item_type),
         }
 
-    @SQLToJSONSchema.to_jsonschema.register  # type: ignore[attr-defined]
+    @to_jsonschema.register  # type: ignore[attr-defined]
     def json_to_jsonschema(self, column_type: postgresql.JSON) -> dict:
         """Override the default mapping for JSON and JSONB columns."""
         if self.json_as_object:
             return {"type": ["object", "null"]}
         return {"type": ["string", "number", "integer", "array", "object", "boolean"]}
 
-    @SQLToJSONSchema.to_jsonschema.register  # type: ignore[attr-defined]
+    @to_jsonschema.register  # type: ignore[attr-defined]
     def datetime_to_jsonschema(self, column_type: sqlalchemy.types.DateTime) -> dict:
         """Override the default mapping for DATETIME columns."""
         if self.dates_as_string:
             return {"type": ["string", "null"]}
         return super().datetime_to_jsonschema(column_type)
 
-    @SQLToJSONSchema.to_jsonschema.register  # type: ignore[attr-defined]
+    @to_jsonschema.register  # type: ignore[attr-defined]
     def date_to_jsonschema(self, column_type: sqlalchemy.types.Date) -> dict:
         """Override the default mapping for DATE columns."""
         if self.dates_as_string: