Adds the mypy linter

Test adapted for new interface.
Exchanged manual input functionality for throwing an exception.
Removed timer at transformer level.

poetry.lock

@@ -651,6 +651,53 @@ files = [
     {file = "mccabe-0.7.0.tar.gz", hash = "sha256:348e0240c33b60bbdf4e523192ef919f28cb2c3d7d5c7794f74009290f236325"},
 ]
 
+[[package]]
+name = "mypy"
+version = "1.2.0"
+description = "Optional static typing for Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "mypy-1.2.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:701189408b460a2ff42b984e6bd45c3f41f0ac9f5f58b8873bbedc511900086d"},
+    {file = "mypy-1.2.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:fe91be1c51c90e2afe6827601ca14353bbf3953f343c2129fa1e247d55fd95ba"},
+    {file = "mypy-1.2.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:8d26b513225ffd3eacece727f4387bdce6469192ef029ca9dd469940158bc89e"},
+    {file = "mypy-1.2.0-cp310-cp310-musllinux_1_1_x86_64.whl", hash = "sha256:3a2d219775a120581a0ae8ca392b31f238d452729adbcb6892fa89688cb8306a"},
+    {file = "mypy-1.2.0-cp310-cp310-win_amd64.whl", hash = "sha256:2e93a8a553e0394b26c4ca683923b85a69f7ccdc0139e6acd1354cc884fe0128"},
+    {file = "mypy-1.2.0-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:3efde4af6f2d3ccf58ae825495dbb8d74abd6d176ee686ce2ab19bd025273f41"},
+    {file = "mypy-1.2.0-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:695c45cea7e8abb6f088a34a6034b1d273122e5530aeebb9c09626cea6dca4cb"},
+    {file = "mypy-1.2.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:d0e9464a0af6715852267bf29c9553e4555b61f5904a4fc538547a4d67617937"},
+    {file = "mypy-1.2.0-cp311-cp311-musllinux_1_1_x86_64.whl", hash = "sha256:8293a216e902ac12779eb7a08f2bc39ec6c878d7c6025aa59464e0c4c16f7eb9"},
+    {file = "mypy-1.2.0-cp311-cp311-win_amd64.whl", hash = "sha256:f46af8d162f3d470d8ffc997aaf7a269996d205f9d746124a179d3abe05ac602"},
+    {file = "mypy-1.2.0-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:031fc69c9a7e12bcc5660b74122ed84b3f1c505e762cc4296884096c6d8ee140"},
+    {file = "mypy-1.2.0-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:390bc685ec209ada4e9d35068ac6988c60160b2b703072d2850457b62499e336"},
+    {file = "mypy-1.2.0-cp37-cp37m-musllinux_1_1_x86_64.whl", hash = "sha256:4b41412df69ec06ab141808d12e0bf2823717b1c363bd77b4c0820feaa37249e"},
+    {file = "mypy-1.2.0-cp37-cp37m-win_amd64.whl", hash = "sha256:4e4a682b3f2489d218751981639cffc4e281d548f9d517addfd5a2917ac78119"},
+    {file = "mypy-1.2.0-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:a197ad3a774f8e74f21e428f0de7f60ad26a8d23437b69638aac2764d1e06a6a"},
+    {file = "mypy-1.2.0-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:c9a084bce1061e55cdc0493a2ad890375af359c766b8ac311ac8120d3a472950"},
+    {file = "mypy-1.2.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:eaeaa0888b7f3ccb7bcd40b50497ca30923dba14f385bde4af78fac713d6d6f6"},
+    {file = "mypy-1.2.0-cp38-cp38-musllinux_1_1_x86_64.whl", hash = "sha256:bea55fc25b96c53affab852ad94bf111a3083bc1d8b0c76a61dd101d8a388cf5"},
+    {file = "mypy-1.2.0-cp38-cp38-win_amd64.whl", hash = "sha256:4c8d8c6b80aa4a1689f2a179d31d86ae1367ea4a12855cc13aa3ba24bb36b2d8"},
+    {file = "mypy-1.2.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:70894c5345bea98321a2fe84df35f43ee7bb0feec117a71420c60459fc3e1eed"},
+    {file = "mypy-1.2.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:4a99fe1768925e4a139aace8f3fb66db3576ee1c30b9c0f70f744ead7e329c9f"},
+    {file = "mypy-1.2.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:023fe9e618182ca6317ae89833ba422c411469156b690fde6a315ad10695a521"},
+    {file = "mypy-1.2.0-cp39-cp39-musllinux_1_1_x86_64.whl", hash = "sha256:4d19f1a239d59f10fdc31263d48b7937c585810288376671eaf75380b074f238"},
+    {file = "mypy-1.2.0-cp39-cp39-win_amd64.whl", hash = "sha256:2de7babe398cb7a85ac7f1fd5c42f396c215ab3eff731b4d761d68d0f6a80f48"},
+    {file = "mypy-1.2.0-py3-none-any.whl", hash = "sha256:d8e9187bfcd5ffedbe87403195e1fc340189a68463903c39e2b63307c9fa0394"},
+    {file = "mypy-1.2.0.tar.gz", hash = "sha256:f70a40410d774ae23fcb4afbbeca652905a04de7948eaf0b1789c8d1426b72d1"},
+]
+
+[package.dependencies]
+mypy-extensions = ">=1.0.0"
+tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
+typing-extensions = ">=3.10"
+
+[package.extras]
+dmypy = ["psutil (>=4.0)"]
+install-types = ["pip"]
+python2 = ["typed-ast (>=1.4.0,<2)"]
+reports = ["lxml"]
+
 [[package]]
 name = "mypy-extensions"
 version = "1.0.0"
@@ -1141,6 +1188,7 @@ files = [
 
 [package.dependencies]
 greenlet = {version = "!=0.4.17", markers = "platform_machine == \"aarch64\" or platform_machine == \"ppc64le\" or platform_machine == \"x86_64\" or platform_machine == \"amd64\" or platform_machine == \"AMD64\" or platform_machine == \"win32\" or platform_machine == \"WIN32\""}
+mypy = {version = ">=0.910", optional = true, markers = "extra == \"mypy\""}
 typing-extensions = ">=4.2.0"
 
 [package.extras]
@@ -1210,4 +1258,4 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.10"
-content-hash = "9d3d37a64fddc6654db1f2606001b81a2432e8f4f667f7146921942f59472614"
+content-hash = "cc31ed1ff1c9e446fcadda094494251b015a103df8024c45e442436856977bbb"

pyproject.toml

@@ -22,9 +22,11 @@ sqlalchemy = "^2.0.9"
 [tool.poetry.group.dev.dependencies]
 black = "^23.3.0"
 flake8 = "^6.0.0"
+mypy = "^1.2.0"
 pytest = "^7.3.0"
 pytest-cov = "^4.0.0"
 pytest-mock = "^3.10.0"
+sqlalchemy = {extras = ["mypy"], version = "^2.0.9"}
 
 [build-system]
 requires = ["poetry-core"]
@@ -32,3 +34,6 @@ build-backend = "poetry.core.masonry.api"
 
 [pytest]
 mock_use_standalone_module = true
+
+[tool.mypy]
+plugins = "sqlalchemy.ext.mypy.plugin"