From 3a7b37e4c7491c613ff54bf6cdeb364b8cb7c66a Mon Sep 17 00:00:00 2001
From: Correl <correl@gmail.com>
Date: Mon, 13 Feb 2023 23:30:42 -0500
Subject: [PATCH] Start tackling mypy errors

---
 poetry.lock        | 1141 +++++++++++++++++++++++++++-----------------
 pyproject.toml     |   19 +
 tutor/csvimport.py |    3 +-
 tutor/database.py  |   44 +-
 tutor/models.py    |    7 +-
 tutor/scryfall.py  |   83 ++--
 tutor/server.py    |   47 +-
 7 files changed, 821 insertions(+), 523 deletions(-)

diff --git a/poetry.lock b/poetry.lock
index 3adbafd..bd021f7 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -1,3 +1,5 @@
+# This file is automatically @generated by Poetry and should not be changed by hand.
+
 [[package]]
 name = "anyio"
 version = "3.6.1"
@@ -5,14 +7,18 @@ description = "High level compatibility layer for multiple asynchronous event lo
 category = "main"
 optional = false
 python-versions = ">=3.6.2"
+files = [
+    {file = "anyio-3.6.1-py3-none-any.whl", hash = "sha256:cb29b9c70620506a9a8f87a309591713446953302d7d995344d0d7c6c0c9a7be"},
+    {file = "anyio-3.6.1.tar.gz", hash = "sha256:413adf95f93886e442aea925f3ee43baa5a765a64a0f52c6081894f9992fdd0b"},
+]
 
 [package.dependencies]
 idna = ">=2.8"
 sniffio = ">=1.1"
 
 [package.extras]
-doc = ["packaging", "sphinx-rtd-theme", "sphinx-autodoc-typehints (>=1.2.0)"]
-test = ["coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "contextlib2", "uvloop (<0.15)", "mock (>=4)", "uvloop (>=0.15)"]
+doc = ["packaging", "sphinx-autodoc-typehints (>=1.2.0)", "sphinx-rtd-theme"]
+test = ["contextlib2", "coverage[toml] (>=4.5)", "hypothesis (>=4.0)", "mock (>=4)", "pytest (>=7.0)", "pytest-mock (>=3.6.1)", "trustme", "uvloop (<0.15)", "uvloop (>=0.15)"]
 trio = ["trio (>=0.16)"]
 
 [[package]]
@@ -22,6 +28,9 @@ description = "Atomic file writes."
 category = "dev"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*"
+files = [
+    {file = "atomicwrites-1.4.1.tar.gz", hash = "sha256:81b2c9071a49367a7f770170e5eec8cb66567cfbbc8c73d20ce5ca4a8d71cf11"},
+]
 
 [[package]]
 name = "attrs"
@@ -30,12 +39,16 @@ description = "Classes Without Boilerplate"
 category = "main"
 optional = false
 python-versions = ">=3.5"
+files = [
+    {file = "attrs-22.1.0-py2.py3-none-any.whl", hash = "sha256:86efa402f67bf2df34f51a335487cf46b1ec130d02b8d39fd248abfd30da551c"},
+    {file = "attrs-22.1.0.tar.gz", hash = "sha256:29adc2665447e5191d0e7c568fde78b21f9672d344281d0c6e1ab085429b22b6"},
+]
 
 [package.extras]
-dev = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "furo", "sphinx", "sphinx-notfound-page", "pre-commit", "cloudpickle"]
-docs = ["furo", "sphinx", "zope.interface", "sphinx-notfound-page"]
-tests = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "zope.interface", "cloudpickle"]
-tests_no_zope = ["coverage[toml] (>=5.0.2)", "hypothesis", "pympler", "pytest (>=4.3.0)", "mypy (>=0.900,!=0.940)", "pytest-mypy-plugins", "cloudpickle"]
+dev = ["cloudpickle", "coverage[toml] (>=5.0.2)", "furo", "hypothesis", "mypy (>=0.900,!=0.940)", "pre-commit", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "sphinx", "sphinx-notfound-page", "zope.interface"]
+docs = ["furo", "sphinx", "sphinx-notfound-page", "zope.interface"]
+tests = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins", "zope.interface"]
+tests-no-zope = ["cloudpickle", "coverage[toml] (>=5.0.2)", "hypothesis", "mypy (>=0.900,!=0.940)", "pympler", "pytest (>=4.3.0)", "pytest-mypy-plugins"]
 
 [[package]]
 name = "black"
@@ -44,6 +57,31 @@ description = "The uncompromising code formatter."
 category = "dev"
 optional = false
 python-versions = ">=3.6.2"
+files = [
+    {file = "black-22.6.0-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:f586c26118bc6e714ec58c09df0157fe2d9ee195c764f630eb0d8e7ccce72e69"},
+    {file = "black-22.6.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:b270a168d69edb8b7ed32c193ef10fd27844e5c60852039599f9184460ce0807"},
+    {file = "black-22.6.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:6797f58943fceb1c461fb572edbe828d811e719c24e03375fd25170ada53825e"},
+    {file = "black-22.6.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:c85928b9d5f83b23cee7d0efcb310172412fbf7cb9d9ce963bd67fd141781def"},
+    {file = "black-22.6.0-cp310-cp310-win_amd64.whl", hash = "sha256:f6fe02afde060bbeef044af7996f335fbe90b039ccf3f5eb8f16df8b20f77666"},
+    {file = "black-22.6.0-cp36-cp36m-macosx_10_9_x86_64.whl", hash = "sha256:cfaf3895a9634e882bf9d2363fed5af8888802d670f58b279b0bece00e9a872d"},
+    {file = "black-22.6.0-cp36-cp36m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:94783f636bca89f11eb5d50437e8e17fbc6a929a628d82304c80fa9cd945f256"},
+    {file = "black-22.6.0-cp36-cp36m-win_amd64.whl", hash = "sha256:2ea29072e954a4d55a2ff58971b83365eba5d3d357352a07a7a4df0d95f51c78"},
+    {file = "black-22.6.0-cp37-cp37m-macosx_10_9_x86_64.whl", hash = "sha256:e439798f819d49ba1c0bd9664427a05aab79bfba777a6db94fd4e56fae0cb849"},
+    {file = "black-22.6.0-cp37-cp37m-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:187d96c5e713f441a5829e77120c269b6514418f4513a390b0499b0987f2ff1c"},
+    {file = "black-22.6.0-cp37-cp37m-win_amd64.whl", hash = "sha256:074458dc2f6e0d3dab7928d4417bb6957bb834434516f21514138437accdbe90"},
+    {file = "black-22.6.0-cp38-cp38-macosx_10_9_universal2.whl", hash = "sha256:a218d7e5856f91d20f04e931b6f16d15356db1c846ee55f01bac297a705ca24f"},
+    {file = "black-22.6.0-cp38-cp38-macosx_10_9_x86_64.whl", hash = "sha256:568ac3c465b1c8b34b61cd7a4e349e93f91abf0f9371eda1cf87194663ab684e"},
+    {file = "black-22.6.0-cp38-cp38-macosx_11_0_arm64.whl", hash = "sha256:6c1734ab264b8f7929cef8ae5f900b85d579e6cbfde09d7387da8f04771b51c6"},
+    {file = "black-22.6.0-cp38-cp38-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:c9a3ac16efe9ec7d7381ddebcc022119794872abce99475345c5a61aa18c45ad"},
+    {file = "black-22.6.0-cp38-cp38-win_amd64.whl", hash = "sha256:b9fd45787ba8aa3f5e0a0a98920c1012c884622c6c920dbe98dbd05bc7c70fbf"},
+    {file = "black-22.6.0-cp39-cp39-macosx_10_9_universal2.whl", hash = "sha256:7ba9be198ecca5031cd78745780d65a3f75a34b2ff9be5837045dce55db83d1c"},
+    {file = "black-22.6.0-cp39-cp39-macosx_10_9_x86_64.whl", hash = "sha256:a3db5b6409b96d9bd543323b23ef32a1a2b06416d525d27e0f67e74f1446c8f2"},
+    {file = "black-22.6.0-cp39-cp39-macosx_11_0_arm64.whl", hash = "sha256:560558527e52ce8afba936fcce93a7411ab40c7d5fe8c2463e279e843c0328ee"},
+    {file = "black-22.6.0-cp39-cp39-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:b154e6bbde1e79ea3260c4b40c0b7b3109ffcdf7bc4ebf8859169a6af72cd70b"},
+    {file = "black-22.6.0-cp39-cp39-win_amd64.whl", hash = "sha256:4af5bc0e1f96be5ae9bd7aaec219c901a94d6caa2484c21983d043371c733fc4"},
+    {file = "black-22.6.0-py3-none-any.whl", hash = "sha256:ac609cf8ef5e7115ddd07d85d988d074ed00e10fbc3445aee393e70164a2219c"},
+    {file = "black-22.6.0.tar.gz", hash = "sha256:6c6d39e28aed379aec40da1c65434c77d75e65bb59a1e1c283de545fb4e7c6c9"},
+]
 
 [package.dependencies]
 click = ">=8.0.0"
@@ -66,6 +104,10 @@ description = "Python package for providing Mozilla's CA Bundle."
 category = "main"
 optional = false
 python-versions = ">=3.6"
+files = [
+    {file = "certifi-2022.6.15-py3-none-any.whl", hash = "sha256:fe86415d55e84719d75f8b69414f6438ac3547d2078ab91b67e779ef69378412"},
+    {file = "certifi-2022.6.15.tar.gz", hash = "sha256:84c85a9078b11105f04f3036a9482ae10e4621616db313fe045dd24743a0820d"},
+]
 
 [[package]]
 name = "click"
@@ -74,6 +116,10 @@ description = "Composable command line interface toolkit"
 category = "main"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "click-8.1.3-py3-none-any.whl", hash = "sha256:bb4d8133cb15a609f44e8213d9b391b0809795062913b383c62be0ee95b1db48"},
+    {file = "click-8.1.3.tar.gz", hash = "sha256:7682dc8afb30297001674575ea00d1814d808d6a36af415a82bd481d37ba7b8e"},
+]
 
 [package.dependencies]
 colorama = {version = "*", markers = "platform_system == \"Windows\""}
@@ -85,6 +131,10 @@ description = "Cross-platform colored terminal text."
 category = "main"
 optional = false
 python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
+files = [
+    {file = "colorama-0.4.5-py2.py3-none-any.whl", hash = "sha256:854bf444933e37f5824ae7bfc1e98d5bce2ebe4160d46b5edf346a89358e99da"},
+    {file = "colorama-0.4.5.tar.gz", hash = "sha256:e6c6b4334fc50988a639d9b98aa429a0b57da6e17b9a44f0451f930b6967b7a4"},
+]
 
 [[package]]
 name = "dictpath"
@@ -93,6 +143,11 @@ description = "Object-oriented dictionary paths"
 category = "main"
 optional = false
 python-versions = ">= 2.7, != 3.0.*, != 3.1.*, != 3.2.*, != 3.3.*, != 3.4.*"
+files = [
+    {file = "dictpath-0.1.3-py2-none-any.whl", hash = "sha256:225248e3c1e7c375495d5da5c390cbf3490f56ee42c151df733e5b2df6b521b5"},
+    {file = "dictpath-0.1.3-py3-none-any.whl", hash = "sha256:d5212361d1fb93909cff715f6e0404e17752cf7a48df3e140639e529a027c437"},
+    {file = "dictpath-0.1.3.tar.gz", hash = "sha256:751cde3b76b176d25f961b90c423a11a4d5ede9bd09ab0d64a85abb738c190d8"},
+]
 
 [[package]]
 name = "h11"
@@ -101,6 +156,10 @@ description = "A pure-Python, bring-your-own-I/O implementation of HTTP/1.1"
 category = "main"
 optional = false
 python-versions = ">=3.6"
+files = [
+    {file = "h11-0.12.0-py3-none-any.whl", hash = "sha256:36a3cb8c0a032f56e2da7084577878a035d3b61d104230d4bd49c0c6b555a9c6"},
+    {file = "h11-0.12.0.tar.gz", hash = "sha256:47222cb6067e4a307d535814917cd98fd0a57b6788ce715755fa2b6c28b56042"},
+]
 
 [[package]]
 name = "httpcore"
@@ -109,6 +168,10 @@ description = "A minimal low-level HTTP client."
 category = "main"
 optional = false
 python-versions = ">=3.6"
+files = [
+    {file = "httpcore-0.13.7-py3-none-any.whl", hash = "sha256:369aa481b014cf046f7067fddd67d00560f2f00426e79569d99cb11245134af0"},
+    {file = "httpcore-0.13.7.tar.gz", hash = "sha256:036f960468759e633574d7c121afba48af6419615d36ab8ede979f1ad6276fa3"},
+]
 
 [package.dependencies]
 anyio = ">=3.0.0,<4.0.0"
@@ -125,6 +188,10 @@ description = "The next generation HTTP client."
 category = "main"
 optional = false
 python-versions = ">=3.6"
+files = [
+    {file = "httpx-0.18.2-py3-none-any.whl", hash = "sha256:979afafecb7d22a1d10340bafb403cf2cb75aff214426ff206521fc79d26408c"},
+    {file = "httpx-0.18.2.tar.gz", hash = "sha256:9f99c15d33642d38bce8405df088c1c4cfd940284b4290cacbfb02e64f4877c6"},
+]
 
 [package.dependencies]
 certifi = "*"
@@ -143,6 +210,10 @@ description = "Python humanize utilities"
 category = "main"
 optional = false
 python-versions = ">=3.6"
+files = [
+    {file = "humanize-3.14.0-py3-none-any.whl", hash = "sha256:32bcf712ac98ff5e73627a9d31e1ba5650619008d6d13543b5d53b48e8ab8d43"},
+    {file = "humanize-3.14.0.tar.gz", hash = "sha256:60dd8c952b1df1ad83f0903844dec50a34ba7a04eea22a6b14204ffb62dbb0a4"},
+]
 
 [package.extras]
 tests = ["freezegun", "pytest", "pytest-cov"]
@@ -154,6 +225,10 @@ description = "Internationalized Domain Names in Applications (IDNA)"
 category = "main"
 optional = false
 python-versions = ">=3.5"
+files = [
+    {file = "idna-3.3-py3-none-any.whl", hash = "sha256:84d9dd047ffa80596e0f246e2eab0b391788b0503584e8945f2368256d2735ff"},
+    {file = "idna-3.3.tar.gz", hash = "sha256:9d643ff0a55b762d5cdb124b8eaa99c66322e2157b69160bc32796e824360e6d"},
+]
 
 [[package]]
 name = "ietfparse"
@@ -162,9 +237,13 @@ description = "Parse formats defined in IETF RFCs"
 category = "main"
 optional = false
 python-versions = "*"
+files = [
+    {file = "ietfparse-1.9.0-py3-none-any.whl", hash = "sha256:72216d31d94764156c4380c419af41295b53a1b309dd8091e5610a411c8b5446"},
+    {file = "ietfparse-1.9.0.tar.gz", hash = "sha256:2a5e7006f742e42a3651cd24d16f050acdf7ae4d0ae0cd576f3f4abc150dc5b3"},
+]
 
 [package.extras]
-dev = ["coverage (==5.5)", "flake8 (==3.9.2)", "mypy (==0.910)", "sphinx (==5.0.2)", "sphinxcontrib-httpdomain (==1.8.0)", "sphinx-autodoc-typehints (==1.18.3)", "sphinx-material (==0.0.35)", "tox (==3.24.1)", "yapf (==0.31.0)"]
+dev = ["coverage (==5.5)", "flake8 (==3.9.2)", "mypy (==0.910)", "sphinx (==5.0.2)", "sphinx-autodoc-typehints (==1.18.3)", "sphinx-material (==0.0.35)", "sphinxcontrib-httpdomain (==1.8.0)", "tox (==3.24.1)", "yapf (==0.31.0)"]
 test = ["coverage (==5.5)"]
 
 [[package]]
@@ -174,6 +253,10 @@ description = "iniconfig: brain-dead simple config-ini parsing"
 category = "dev"
 optional = false
 python-versions = "*"
+files = [
+    {file = "iniconfig-1.1.1-py2.py3-none-any.whl", hash = "sha256:011e24c64b7f47f6ebd835bb12a743f2fbe9a26d4cecaa7f53bc4f35ee9da8b3"},
+    {file = "iniconfig-1.1.1.tar.gz", hash = "sha256:bc3af051d7d14b2ee5ef9969666def0cd1a000e121eaea580d4a313df4b37f32"},
+]
 
 [[package]]
 name = "isodate"
@@ -182,6 +265,10 @@ description = "An ISO 8601 date/time/duration parser and formatter"
 category = "main"
 optional = false
 python-versions = "*"
+files = [
+    {file = "isodate-0.6.1-py2.py3-none-any.whl", hash = "sha256:0751eece944162659049d35f4f549ed815792b38793f07cf73381c1c87cbed96"},
+    {file = "isodate-0.6.1.tar.gz", hash = "sha256:48c5881de7e8b0a0d648cb024c8062dc84e7b840ed81e864c7614fd3c127bde9"},
+]
 
 [package.dependencies]
 six = "*"
@@ -193,6 +280,10 @@ description = "An implementation of JSON Schema validation for Python"
 category = "main"
 optional = false
 python-versions = ">=3.7"
+files = [
+    {file = "jsonschema-4.16.0-py3-none-any.whl", hash = "sha256:9e74b8f9738d6a946d70705dc692b74b5429cd0960d58e79ffecfc43b2221eb9"},
+    {file = "jsonschema-4.16.0.tar.gz", hash = "sha256:165059f076eff6971bae5b742fc029a7b4ef3f9bcf04c14e4776a7605de14b23"},
+]
 
 [package.dependencies]
 attrs = ">=17.4.0"
@@ -209,6 +300,9 @@ description = "Stream JSON parser with iterator interface"
 category = "main"
 optional = false
 python-versions = "*"
+files = [
+    {file = "jsonslicer-0.1.7.tar.gz", hash = "sha256:fa01a79e0c699208deee6514a17b0bb28c1b661aa795491d33c796b162c4b4cc"},
+]
 
 [[package]]
 name = "lazy-object-proxy"
@@ -217,409 +311,7 @@ description = "A fast and thorough lazy object proxy."
 category = "main"
 optional = false
 python-versions = ">=3.6"
-
-[[package]]
-name = "markupsafe"
-version = "2.1.1"
-description = "Safely add untrusted strings to HTML/XML markup."
-category = "main"
-optional = false
-python-versions = ">=3.7"
-
-[[package]]
-name = "more-itertools"
-version = "8.14.0"
-description = "More routines for operating on iterables, beyond itertools"
-category = "main"
-optional = false
-python-versions = ">=3.5"
-
-[[package]]
-name = "mypy"
-version = "0.971"
-description = "Optional static typing for Python"
-category = "dev"
-optional = false
-python-versions = ">=3.6"
-
-[package.dependencies]
-mypy-extensions = ">=0.4.3"
-tomli = {version = ">=1.1.0", markers = "python_version < \"3.11\""}
-typing-extensions = ">=3.10"
-
-[package.extras]
-dmypy = ["psutil (>=4.0)"]
-python2 = ["typed-ast (>=1.4.0,<2)"]
-reports = ["lxml"]
-
-[[package]]
-name = "mypy-extensions"
-version = "0.4.3"
-description = "Experimental type system extensions for programs checked with the mypy typechecker."
-category = "dev"
-optional = false
-python-versions = "*"
-
-[[package]]
-name = "openapi-core"
-version = "0.14.5"
-description = "client-side and server-side support for the OpenAPI Specification v3"
-category = "main"
-optional = false
-python-versions = ">= 2.7, != 3.0.*, != 3.1.*, != 3.2.*, != 3.3.*, != 3.4.*"
-
-[package.dependencies]
-attrs = "*"
-dictpath = "*"
-isodate = "*"
-lazy-object-proxy = "*"
-more-itertools = "*"
-openapi-schema-validator = "<0.3.0"
-openapi-spec-validator = "<0.5.0"
-parse = "*"
-six = "*"
-werkzeug = "*"
-
-[package.extras]
-django = ["django (<2.0)", "django (>=2.2)"]
-flask = ["flask", "flask (<2.0.0)"]
-requests = ["requests", "requests (<2.28.0)"]
-
-[[package]]
-name = "openapi-schema-validator"
-version = "0.2.3"
-description = "OpenAPI schema validation for Python"
-category = "main"
-optional = false
-python-versions = ">=3.7.0,<4.0.0"
-
-[package.dependencies]
-jsonschema = ">=3.0.0,<5.0.0"
-
-[package.extras]
-isodate = ["isodate"]
-strict-rfc3339 = ["strict-rfc3339"]
-rfc3339-validator = ["rfc3339-validator"]
-
-[[package]]
-name = "openapi-spec-validator"
-version = "0.4.0"
-description = "OpenAPI 2.0 (aka Swagger) and OpenAPI 3.0 spec validator"
-category = "main"
-optional = false
-python-versions = ">=3.7.0,<4.0.0"
-
-[package.dependencies]
-jsonschema = ">=3.2.0,<5.0.0"
-openapi-schema-validator = ">=0.2.0,<0.3.0"
-PyYAML = ">=5.1"
-
-[package.extras]
-requests = ["requests"]
-
-[[package]]
-name = "packaging"
-version = "21.3"
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+]
+
+[[package]]
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+version = "7.1.2"
+description = "pytest: simple powerful testing with Python"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
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+attrs = ">=19.2.0"
+colorama = {version = "*", markers = "sys_platform == \"win32\""}
+iniconfig = "*"
+packaging = "*"
+pluggy = ">=0.12,<2.0"
+py = ">=1.8.2"
+tomli = ">=1.0.0"
+
+[package.extras]
+testing = ["argcomplete", "hypothesis (>=3.56)", "mock", "nose", "pygments (>=2.7.2)", "requests", "xmlschema"]
+
+[[package]]
+name = "pyyaml"
+version = "6.0"
+description = "YAML parser and emitter for Python"
+category = "main"
+optional = false
+python-versions = ">=3.6"
+files = [
     {file = "PyYAML-6.0-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:d4db7c7aef085872ef65a8fd7d6d09a14ae91f691dec3e87ee5ee0539d516f53"},
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@@ -703,6 +767,13 @@ pyyaml = [
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     {file = "PyYAML-6.0-cp310-cp310-win_amd64.whl", hash = "sha256:daf496c58a8c52083df09b80c860005194014c3698698d1a57cbcfa182142a3a"},
+    {file = "PyYAML-6.0-cp311-cp311-macosx_10_9_x86_64.whl", hash = "sha256:d4b0ba9512519522b118090257be113b9468d804b19d63c71dbcf4a48fa32358"},
+    {file = "PyYAML-6.0-cp311-cp311-macosx_11_0_arm64.whl", hash = "sha256:81957921f441d50af23654aa6c5e5eaf9b06aba7f0a19c18a538dc7ef291c5a1"},
+    {file = "PyYAML-6.0-cp311-cp311-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:afa17f5bc4d1b10afd4466fd3a44dc0e245382deca5b3c353d8b757f9e3ecb8d"},
+    {file = "PyYAML-6.0-cp311-cp311-manylinux_2_17_s390x.manylinux2014_s390x.whl", hash = "sha256:dbad0e9d368bb989f4515da330b88a057617d16b6a8245084f1b05400f24609f"},
+    {file = "PyYAML-6.0-cp311-cp311-manylinux_2_17_x86_64.manylinux2014_x86_64.whl", hash = "sha256:432557aa2c09802be39460360ddffd48156e30721f5e8d917f01d31694216782"},
+    {file = "PyYAML-6.0-cp311-cp311-win32.whl", hash = "sha256:bfaef573a63ba8923503d27530362590ff4f576c626d86a9fed95822a8255fd7"},
+    {file = "PyYAML-6.0-cp311-cp311-win_amd64.whl", hash = "sha256:01b45c0191e6d66c470b6cf1b9531a771a83c1c4208272ead47a3ae4f2f603bf"},
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     {file = "PyYAML-6.0-cp36-cp36m-manylinux_2_17_aarch64.manylinux2014_aarch64.whl", hash = "sha256:50602afada6d6cbfad699b0c7bb50d5ccffa7e46a3d738092afddc1f9758427f"},
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@@ -730,26 +801,208 @@ pyyaml = [
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 ]
-rfc3986 = [
+
+[[package]]
+name = "returns"
+version = "0.19.0"
+description = "Make your functions return something meaningful, typed, and safe!"
+category = "main"
+optional = false
+python-versions = ">=3.7,<4.0"
+files = [
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+
+[package.dependencies]
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+
+[[package]]
+name = "rfc3986"
+version = "1.5.0"
+description = "Validating URI References per RFC 3986"
+category = "main"
+optional = false
+python-versions = "*"
+files = [
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 ]
-six = [
+
+[package.dependencies]
+idna = {version = "*", optional = true, markers = "extra == \"idna2008\""}
+
+[package.extras]
+idna2008 = ["idna"]
+
+[[package]]
+name = "setuptools"
+version = "67.2.0"
+description = "Easily download, build, install, upgrade, and uninstall Python packages"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
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+]
+
+[package.extras]
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+testing = ["build[virtualenv]", "filelock (>=3.4.0)", "flake8 (<5)", "flake8-2020", "ini2toml[lite] (>=0.9)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pip (>=19.1)", "pip-run (>=8.8)", "pytest (>=6)", "pytest-black (>=0.3.7)", "pytest-checkdocs (>=2.4)", "pytest-cov", "pytest-enabler (>=1.3)", "pytest-flake8", "pytest-mypy (>=0.9.1)", "pytest-perf", "pytest-timeout", "pytest-xdist", "tomli-w (>=1.0.0)", "virtualenv (>=13.0.0)", "wheel"]
+testing-integration = ["build[virtualenv]", "filelock (>=3.4.0)", "jaraco.envs (>=2.2)", "jaraco.path (>=3.2.0)", "pytest", "pytest-enabler", "pytest-xdist", "tomli", "virtualenv (>=13.0.0)", "wheel"]
+
+[[package]]
+name = "six"
+version = "1.16.0"
+description = "Python 2 and 3 compatibility utilities"
+category = "main"
+optional = false
+python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*"
+files = [
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 ]
-sniffio = [
+
+[[package]]
+name = "sniffio"
+version = "1.2.0"
+description = "Sniff out which async library your code is running under"
+category = "main"
+optional = false
+python-versions = ">=3.5"
+files = [
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 ]
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-tornado = []
-tornado-openapi3 = []
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+
+[[package]]
+name = "tomli"
+version = "2.0.1"
+description = "A lil' TOML parser"
+category = "dev"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "tomli-2.0.1-py3-none-any.whl", hash = "sha256:939de3e7a6161af0c887ef91b7d41a53e7c5a1ca976325f429cb46ea9bc30ecc"},
+    {file = "tomli-2.0.1.tar.gz", hash = "sha256:de526c12914f0c550d15924c62d72abc48d6fe7364aa87328337a31007fe8a4f"},
 ]
-tzdata = []
-werkzeug = []
+
+[[package]]
+name = "tornado"
+version = "6.2"
+description = "Tornado is a Python web framework and asynchronous networking library, originally developed at FriendFeed."
+category = "main"
+optional = false
+python-versions = ">= 3.7"
+files = [
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+    {file = "tornado-6.2.tar.gz", hash = "sha256:9b630419bde84ec666bfd7ea0a4cb2a8a651c2d5cccdbdd1972a0c859dfc3c13"},
+]
+
+[[package]]
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+version = "1.1.1"
+description = "Tornado OpenAPI 3 request and response validation library"
+category = "main"
+optional = false
+python-versions = ">=3.7,<4.0"
+files = [
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+    {file = "tornado_openapi3-1.1.1-py3-none-any.whl", hash = "sha256:ae3ee0302d5512629ef1111c7c6efe0d8ff32d437fd5ed4aee524e363e7250bd"},
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+openapi-core = ">=0.14.2,<0.15.0"
+tornado = ">=4,<7"
+typing-extensions = ">=4.0.1,<5.0.0"
+
+[[package]]
+name = "tqdm"
+version = "4.64.0"
+description = "Fast, Extensible Progress Meter"
+category = "main"
+optional = false
+python-versions = "!=3.0.*,!=3.1.*,!=3.2.*,!=3.3.*,>=2.7"
+files = [
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+]
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+[package.dependencies]
+colorama = {version = "*", markers = "platform_system == \"Windows\""}
+
+[package.extras]
+dev = ["py-make (>=0.1.0)", "twine", "wheel"]
+notebook = ["ipywidgets (>=6)"]
+slack = ["slack-sdk"]
+telegram = ["requests"]
+
+[[package]]
+name = "types-pyyaml"
+version = "6.0.12.6"
+description = "Typing stubs for PyYAML"
+category = "dev"
+optional = false
+python-versions = "*"
+files = [
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+    {file = "types_PyYAML-6.0.12.6-py3-none-any.whl", hash = "sha256:77b74d0874482f2b42dd566b7277b0a220068595e0fb42689d0c0560f3d1ae9e"},
+]
+
+[[package]]
+name = "typing-extensions"
+version = "4.4.0"
+description = "Backported and Experimental Type Hints for Python 3.7+"
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "typing_extensions-4.4.0-py3-none-any.whl", hash = "sha256:16fa4864408f655d35ec496218b85f79b3437c829e93320c7c9215ccfd92489e"},
+    {file = "typing_extensions-4.4.0.tar.gz", hash = "sha256:1511434bb92bf8dd198c12b1cc812e800d4181cfcb867674e0f8279cc93087aa"},
+]
+
+[[package]]
+name = "tzdata"
+version = "2022.1"
+description = "Provider of IANA time zone data"
+category = "main"
+optional = false
+python-versions = ">=2"
+files = [
+    {file = "tzdata-2022.1-py2.py3-none-any.whl", hash = "sha256:238e70234214138ed7b4e8a0fab0e5e13872edab3be586ab8198c407620e2ab9"},
+    {file = "tzdata-2022.1.tar.gz", hash = "sha256:8b536a8ec63dc0751342b3984193a3118f8fca2afe25752bb9b7fffd398552d3"},
+]
+
+[[package]]
+name = "werkzeug"
+version = "2.2.2"
+description = "The comprehensive WSGI web application library."
+category = "main"
+optional = false
+python-versions = ">=3.7"
+files = [
+    {file = "Werkzeug-2.2.2-py3-none-any.whl", hash = "sha256:f979ab81f58d7318e064e99c4506445d60135ac5cd2e177a2de0089bfd4c9bd5"},
+    {file = "Werkzeug-2.2.2.tar.gz", hash = "sha256:7ea2d48322cc7c0f8b3a215ed73eabd7b5d75d0b50e31ab006286ccff9e00b8f"},
+]
+
+[package.dependencies]
+MarkupSafe = ">=2.1.1"
+
+[package.extras]
+watchdog = ["watchdog"]
+
+[metadata]
+lock-version = "2.0"
+python-versions = "^3.9"
+content-hash = "24a0b5c8304daa703c2ccc8d8289753a8b7bcd08fb9b49ea91819c50cd7b58de"
diff --git a/pyproject.toml b/pyproject.toml
index ad289d2..1019468 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -16,6 +16,7 @@ tqdm = "^4.64.0"
 psycopg = {extras = ["c", "pool"], version = "^3.0"}
 tornado-openapi3 = "^1.1.0"
 PyYAML = "^6.0"
+returns = "^0.19.0"
 
 [tool.poetry.dev-dependencies]
 pytest = "*"
@@ -25,6 +26,24 @@ mypy = "*"
 [tool.poetry.scripts]
 tutor = 'tutor.cli:main'
 
+[tool.poetry.group.dev.dependencies]
+types-pyyaml = "^6.0.12.6"
+
+[tool.mypy]
+plugins = "returns.contrib.mypy.returns_plugin"
+
+[[tool.mypy.overrides]]
+module = "humanize"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "parsy"
+ignore_missing_imports = true
+
+[[tool.mypy.overrides]]
+module = "tqdm"
+ignore_missing_imports = true
+
 [build-system]
 requires = ["poetry>=0.12"]
 build-backend = "poetry.masonry.api"
diff --git a/tutor/csvimport.py b/tutor/csvimport.py
index fe8f0a1..db5d413 100644
--- a/tutor/csvimport.py
+++ b/tutor/csvimport.py
@@ -16,14 +16,13 @@ class ImportMode(enum.Enum):
 
 async def load(
     settings: dict, stream: typing.IO, mode: ImportMode = ImportMode.add
-) -> typing.Iterable[typing.Tuple[tutor.models.Card, int]]:
+) -> typing.AsyncIterable[typing.Tuple[tutor.models.CardCopy, int]]:
     """Load cards from a CSV file.
 
     Currently supports the following formats:
     - Deckbox (set name match can fail)
     - MTGStand (uses Scryfall ID)
     """
-    cards = []
     async with await psycopg.AsyncConnection.connect(
             settings["database"], autocommit=False
         ) as conn:
diff --git a/tutor/database.py b/tutor/database.py
index 3488bce..83f3dc5 100644
--- a/tutor/database.py
+++ b/tutor/database.py
@@ -24,7 +24,7 @@ def convert_price(price: typing.Optional[str]) -> typing.Optional[decimal.Decima
 
 
 async def search(
-    db: psycopg.Cursor,
+    db: psycopg.AsyncCursor,
     name: typing.Optional[str] = None,
     collector_number: typing.Optional[str] = None,
     set_code: typing.Optional[str] = None,
@@ -39,7 +39,7 @@ async def search(
     db.row_factory = psycopg.rows.dict_row
     joins = []
     constraints = []
-    params = {}
+    params: typing.Dict[str, typing.Any] = {}
     if name is not None:
         constraints.append("cards.name LIKE %(name)s")
         params["name"] = name
@@ -102,7 +102,7 @@ async def search(
 
 
 async def advanced_search(
-    db: psycopg.Cursor,
+    db: psycopg.AsyncCursor,
     search: tutor.search.Search,
     limit: int = 10,
     offset: int = 0,
@@ -112,8 +112,7 @@ async def advanced_search(
     db.row_factory = psycopg.rows.dict_row
     joins = []
     constraints = []
-    params = {}
-    sets = []
+    params: typing.Dict[str, typing.Any] = {}
 
     logger.debug("Performing search for: %s", search)
     for i, criterion in enumerate(search.criteria):
@@ -244,7 +243,7 @@ async def advanced_search(
 
 
 async def oracle_id_by_name(
-    db: psycopg.Cursor, name: str
+    db: psycopg.AsyncCursor, name: str
 ) -> typing.Optional[uuid.UUID]:
     db.row_factory = psycopg.rows.dict_row
     await db.execute(
@@ -253,9 +252,11 @@ async def oracle_id_by_name(
     row = await db.fetchone()
     if row:
         return row["oracle_id"]
+    else:
+        return None
 
 
-async def store_card(db: psycopg.Cursor, card: tutor.models.Card) -> None:
+async def store_card(db: psycopg.AsyncCursor, card: tutor.models.Card) -> None:
     await db.execute(
         """
         INSERT INTO tmp_cards
@@ -286,7 +287,7 @@ async def store_card(db: psycopg.Cursor, card: tutor.models.Card) -> None:
 
 
 async def store_price(
-    db: psycopg.Cursor, date: datetime.date, card: tutor.models.Card
+    db: psycopg.AsyncCursor, date: datetime.date, card: tutor.models.Card
 ) -> None:
     await db.execute(
         """
@@ -306,7 +307,7 @@ async def store_price(
     )
 
 
-async def store_set(db: psycopg.Cursor, set_code: str, name: str) -> None:
+async def store_set(db: psycopg.AsyncCursor, set_code: str, name: str) -> None:
     await db.execute(
         """
         INSERT INTO "sets" ("set_code", "name")
@@ -317,7 +318,7 @@ async def store_set(db: psycopg.Cursor, set_code: str, name: str) -> None:
     )
 
 
-async def store_copy(db: psycopg.Cursor, copy: tutor.models.CardCopy) -> None:
+async def store_copy(db: psycopg.AsyncCursor, copy: tutor.models.CardCopy) -> None:
     await db.execute(
         """
         INSERT INTO copies ("scryfall_id", "isFoil", "collection", "condition")
@@ -332,24 +333,29 @@ async def store_copy(db: psycopg.Cursor, copy: tutor.models.CardCopy) -> None:
     )
 
 
-async def clear_copies(db: psycopg.Cursor, collection: typing.Optional[str] = None):
+async def clear_copies(
+    db: psycopg.AsyncCursor, collection: typing.Optional[str] = None
+):
     if collection:
         await db.execute("DELETE FROM copies WHERE collection = %s", collection)
     else:
         await db.execute("DELETE FROM copies")
 
 
-async def store_deck(db: psycopg.Cursor, name: str) -> None:
+async def store_deck(db: psycopg.AsyncCursor, name: str) -> typing.Optional[int]:
     await db.execute(
         'INSERT INTO "decks" ("name") VALUES (%(name)s) RETURNING "deck_id"',
         {"name": name},
     )
     result = await db.fetchone()
-    return result[0]
+    if result:
+        return result[0]
+    else:
+        return None
 
 
 async def store_deck_card(
-    db: psycopg.Cursor, deck_id: int, oracle_id: uuid.UUID, quantity: int = 1
+    db: psycopg.AsyncCursor, deck_id: int, oracle_id: uuid.UUID, quantity: int = 1
 ) -> None:
     await db.execute(
         """
@@ -361,7 +367,7 @@ async def store_deck_card(
 
 
 async def get_decks(
-    db: psycopg.Cursor, limit: int = 10, offset: int = 0
+    db: psycopg.AsyncCursor, limit: int = 10, offset: int = 0
 ) -> typing.List[tutor.models.Deck]:
     db.row_factory = psycopg.rows.dict_row
     await db.execute(
@@ -443,7 +449,7 @@ async def get_decks(
 
 
 async def get_deck(
-    db: psycopg.Cursor, deck_id: int
+    db: psycopg.AsyncCursor, deck_id: int
 ) -> typing.Optional[tutor.models.Deck]:
     db.row_factory = psycopg.rows.dict_row
     await db.execute(
@@ -519,9 +525,11 @@ async def get_deck(
                 if card and card.get("oracle_id")
             ],
         )
+    else:
+        return None
 
 
-async def store_var(db: psycopg.Cursor, key: str, value: str) -> None:
+async def store_var(db: psycopg.AsyncCursor, key: str, value: str) -> None:
     await db.execute(
         """
         INSERT INTO "vars" ("key", "value")
@@ -533,7 +541,7 @@ async def store_var(db: psycopg.Cursor, key: str, value: str) -> None:
     )
 
 
-async def collection_stats(db: psycopg.Cursor) -> dict:
+async def collection_stats(db: psycopg.AsyncCursor) -> typing.Optional[dict]:
     db.row_factory = psycopg.rows.dict_row
     await db.execute(
         """
diff --git a/tutor/models.py b/tutor/models.py
index 9236f27..3bbd4ea 100644
--- a/tutor/models.py
+++ b/tutor/models.py
@@ -15,10 +15,11 @@ class Color(enum.IntEnum):
     Red = 5
 
     def __str__(self) -> str:
-        return dict(zip(Color, "CWUBGR")).get(self.value).replace("C", "")
+        colors: typing.Dict[int, str] = dict(zip(Color, "CWUBGR"))
+        return colors.get(self.value, "").replace("C", "")
 
     @staticmethod
-    def to_string(colors: typing.List["Color"]) -> str:
+    def to_string(colors: typing.Iterable["Color"]) -> str:
         return "".join(map(str, sorted(colors)))
 
     @staticmethod
@@ -84,7 +85,7 @@ class Card:
     set_code: str
     set_name: str
     collector_number: str
-    rarity: str
+    rarity: Rarity
     color_identity: typing.List[Color]
     cmc: decimal.Decimal
     type_line: str
diff --git a/tutor/scryfall.py b/tutor/scryfall.py
index b058441..b17fb29 100644
--- a/tutor/scryfall.py
+++ b/tutor/scryfall.py
@@ -1,46 +1,57 @@
 import datetime
 import decimal
+import uuid
+from returns.maybe import Maybe
 
 import tutor.models
 
 
-def to_card(data: dict) -> tutor.models.Card:
+def to_card(data: dict) -> Maybe[tutor.models.Card]:
     prices = {
         k: decimal.Decimal(v) if v else None for k, v in data.get("prices", {}).items()
     }
-    return tutor.models.Card(
-        scryfall_id=data["id"],
-        oracle_id=data.get("oracle_id"),
-        name=data["name"],
-        set_code=data["set"].upper() if "set" in data else None,
-        set_name=data.get("set_name"),
-        collector_number=data.get("collector_number"),
-        rarity=tutor.models.Rarity.from_string(data.get("rarity", "n/a")),
-        color_identity=tutor.models.Color.from_string(
-            "".join(data.get("color_identity", []))
-        ),
-        cmc=decimal.Decimal(data.get("cmc", "0")),
-        mana_cost=data.get("mana_cost"),
-        type_line=data.get("type_line", ""),
-        release_date=datetime.date.fromisoformat(data["released_at"])
-        if "released_at" in data
-        else None,
-        games={
-            game for game in tutor.models.Game if game.value in data.get("games", [])
-        },
-        legalities={
-            game_format: {l.value: l for l in tutor.models.Legality}[legality]
-            for game_format, legality in data.get("legalities", {}).items()
-        },
-        edhrec_rank=(
-            int(data.get("edhrec_rank"))
-            if data.get("edhrec_rank") is not None
-            else None
-        ),
-        oracle_text=data.get("oracle_text"),
-        price_usd=prices.get("usd"),
-        price_usd_foil=prices.get("usd_foil"),
-        price_eur=prices.get("eur"),
-        price_eur_foil=prices.get("eur_foil"),
-        price_tix=prices.get("tix"),
+    return Maybe.do(
+        tutor.models.Card(
+            scryfall_id=data["id"],
+            oracle_id=oracle_id,
+            name=data["name"],
+            set_code=set_code,
+            set_name=set_name,
+            collector_number=collector_number,
+            rarity=tutor.models.Rarity.from_string(data.get("rarity", "n/a")),
+            color_identity=tutor.models.Color.from_string(
+                "".join(data.get("color_identity", []))
+            ),
+            cmc=decimal.Decimal(data.get("cmc", "0")),
+            mana_cost=data.get("mana_cost"),
+            type_line=data.get("type_line", ""),
+            release_date=release_date,
+            games={
+                game
+                for game in tutor.models.Game
+                if game.value in data.get("games", [])
+            },
+            legalities={
+                game_format: {l.value: l for l in tutor.models.Legality}[legality]
+                for game_format, legality in data.get("legalities", {}).items()
+            },
+            edhrec_rank=Maybe.from_optional(data.get("edhrec_rank"))
+            .map(int)
+            .value_or(None),
+            oracle_text=data.get("oracle_text"),
+            price_usd=prices.get("usd"),
+            price_usd_foil=prices.get("usd_foil"),
+            price_eur=prices.get("eur"),
+            price_eur_foil=prices.get("eur_foil"),
+            price_tix=prices.get("tix"),
+        )
+        for oracle_id in Maybe.from_optional(data.get("oracle_id")).map(uuid.UUID)
+        for set_code in Maybe.from_optional(data.get("set")).map(str.upper)
+        for set_name in Maybe.from_optional(data.get("set_name")).map(str)
+        for collector_number in Maybe.from_optional(data.get("collector_number")).map(
+            str
+        )
+        for release_date in Maybe.from_optional(data.get("released_at")).map(
+            datetime.date.fromisoformat
+        )
     )
diff --git a/tutor/server.py b/tutor/server.py
index 7ad90f2..4673a03 100644
--- a/tutor/server.py
+++ b/tutor/server.py
@@ -92,7 +92,7 @@ class JSONEncoder(json.JSONEncoder):
             },
         }
 
-    def _card_copy(self, copy: tutor.models.Card) -> dict:
+    def _card_copy(self, copy: tutor.models.CardCopy) -> dict:
         return {
             "card": self._card(copy.card),
             "foil": copy.foil,
@@ -133,16 +133,6 @@ class OpenAPIRequestHandler(tornado_openapi3.handler.OpenAPIRequestHandler):
 
 
 class RequestHandler(tornado.web.RequestHandler):
-    def set_links(self, **links) -> None:
-        self.set_header(
-            "Link",
-            ", ".join(
-                [f'<{self.url(url)}>; rel="{rel}"' for rel, url in links.items()]
-            ),
-        )
-
-
-class SearchHandler(RequestHandler):
     def url(self, url: str) -> str:
         scheme_override = self.application.settings["scheme"]
         if not scheme_override:
@@ -158,13 +148,30 @@ class SearchHandler(RequestHandler):
             )
         )
 
+    def set_links(self, **links) -> None:
+        self.set_header(
+            "Link",
+            ", ".join(
+                [f'<{self.url(url)}>; rel="{rel}"' for rel, url in links.items()]
+            ),
+        )
+
+    @property
+    def pool(self) -> psycopg_pool.AsyncConnectionPool:
+        pool = getattr(self.application, "pool", None)
+        if not pool:
+            raise RuntimeError("Database pool not initialized")
+        return pool
+
+
+class SearchHandler(RequestHandler):
     async def get(self) -> None:
-        async with self.application.pool.connection() as conn:
+        async with self.pool.connection() as conn:
             async with conn.cursor() as cursor:
                 query = self.get_argument("q", "")
                 in_collection = self.get_argument("in_collection", None)
-                page = max(1, int(self.get_argument("page", 1)))
-                limit = int(self.get_argument("limit", 10))
+                page = max(1, int(self.get_argument("page", "1")))
+                limit = int(self.get_argument("limit", "10"))
                 sort_by = self.get_argument("sort_by", "rarity")
                 search = tutor.search.search.parse(query)
                 copies = await tutor.database.advanced_search(
@@ -192,7 +199,7 @@ class SearchHandler(RequestHandler):
 
 class CollectionHandler(RequestHandler):
     async def get(self) -> None:
-        async with self.application.pool.connection() as conn:
+        async with self.pool.connection() as conn:
             async with conn.cursor() as cursor:
                 self.write(
                     json.dumps(
@@ -203,9 +210,9 @@ class CollectionHandler(RequestHandler):
 
 class DecksHandler(RequestHandler):
     async def get(self) -> None:
-        page = max(1, int(self.get_argument("page", 1)))
-        limit = int(self.get_argument("limit", 10))
-        async with self.application.pool.connection() as conn:
+        page = max(1, int(self.get_argument("page", "1")))
+        limit = int(self.get_argument("limit", "10"))
+        async with self.pool.connection() as conn:
             async with conn.cursor() as cursor:
                 decks = await tutor.database.get_decks(
                     cursor, limit=limit + 1, offset=limit * (page - 1)
@@ -229,7 +236,7 @@ class DeckHandler(RequestHandler):
     async def get(self, deck_id) -> None:
         self.set_header("Content-Type", "application/json")
         self.set_header("Access-Control-Allow-Origin", "*")
-        async with self.application.pool.connection() as conn:
+        async with self.pool.connection() as conn:
             async with conn.cursor() as cursor:
                 deck = await tutor.database.get_deck(cursor, deck_id)
         if not deck:
@@ -253,7 +260,7 @@ class TemplateHandler(RequestHandler):
 
     async def get(self) -> None:
         self.set_header("Content-Type", self.content_type)
-        return self.render(self.path, **self.vars)
+        self.render(self.path, **self.vars)
 
 
 class StaticFileHandler(tornado.web.StaticFileHandler):