diff --git a/poetry.lock b/poetry.lock
index 66f4150a..3e154820 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -28,6 +28,32 @@ files = [
     {file = "alabaster-0.7.16.tar.gz", hash = "sha256:75a8b99c28a5dad50dd7f8ccdd447a121ddb3892da9e53d1ca5cca3106d58d65"},
 ]
 
+[[package]]
+name = "altair"
+version = "6.2.2"
+description = "Vega-Altair: A declarative statistical visualization library for Python."
+optional = true
+python-versions = ">=3.10"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "altair-6.2.2-py3-none-any.whl", hash = "sha256:94014f8ad8617c3cb163d1137359cd6db5ba134b9b46d93cfd8b609fd245a583"},
+    {file = "altair-6.2.2.tar.gz", hash = "sha256:a1ff9d9cfe81c75414641826312b9471780e19d39293ba0b012933f6b6cba0fe"},
+]
+
+[package.dependencies]
+jinja2 = "*"
+jsonschema = ">=3.0"
+narwhals = ">=2.4.0"
+packaging = "*"
+typing-extensions = {version = ">=4.12.0", markers = "python_version < \"3.15\""}
+
+[package.extras]
+all = ["altair-tiles (>=0.3.0)", "anywidget (>=0.9.0)", "numpy", "pandas (>=1.1.3)", "pyarrow (>=11)", "vegafusion (>=2.0.3)", "vl-convert-python (>=1.9.0)"]
+dev = ["duckdb (>=1.0)", "geopandas (>=0.14.3)", "hatch (>=1.13.0)", "ipykernel", "ipython", "mistune", "mypy", "pandas (>=1.1.3)", "pandas-stubs (<2.3.3) ; python_version < \"3.11\"", "pandas-stubs (>=3.0.3.260530) ; python_version >= \"3.11\"", "polars (>=0.20.3)", "pyarrow-stubs", "pytest", "pytest-cov", "pytest-xdist[psutil] (>=3.5,<4.0)", "ruff (>=0.9.5)", "taskipy (>=1.14.1)", "tomli (>=2.2.1)", "ty", "types-jsonschema", "types-setuptools"]
+doc = ["docutils", "jinja2", "myst-parser", "numpydoc", "pillow", "pydata-sphinx-theme (>=0.14.1)", "scipy", "scipy-stubs ; python_version >= \"3.10\"", "sphinx", "sphinx-autobuild", "sphinx-copybutton", "sphinx-design", "sphinxext-altair"]
+save = ["vl-convert-python (>=1.9.0)"]
+
 [[package]]
 name = "annotated-doc"
 version = "0.0.4"
@@ -207,11 +233,12 @@ version = "26.1.0"
 description = "Classes Without Boilerplate"
 optional = false
 python-versions = ">=3.9"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "attrs-26.1.0-py3-none-any.whl", hash = "sha256:c647aa4a12dfbad9333ca4e71fe62ddc36f4e63b2d260a37a8b83d2f043ac309"},
     {file = "attrs-26.1.0.tar.gz", hash = "sha256:d03ceb89cb322a8fd706d4fb91940737b6642aa36998fe130a9bc96c985eff32"},
 ]
+markers = {main = "extra == \"web\""}
 
 [[package]]
 name = "babel"
@@ -321,6 +348,19 @@ webencodings = "*"
 [package.extras]
 css = ["tinycss2 (>=1.1.0)"]
 
+[[package]]
+name = "blinker"
+version = "1.9.0"
+description = "Fast, simple object-to-object and broadcast signaling"
+optional = true
+python-versions = ">=3.9"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "blinker-1.9.0-py3-none-any.whl", hash = "sha256:ba0efaa9080b619ff2f3459d1d500c57bddea4a6b424b60a91141db6fd2f08bc"},
+    {file = "blinker-1.9.0.tar.gz", hash = "sha256:b4ce2265a7abece45e7cc896e98dbebe6cead56bcf805a3d23136d145f5445bf"},
+]
+
 [[package]]
 name = "boto3"
 version = "1.43.14"
@@ -361,6 +401,19 @@ urllib3 = ">=1.25.4,<2.2.0 || >2.2.0,<3"
 [package.extras]
 crt = ["awscrt (==0.32.2)"]
 
+[[package]]
+name = "cachetools"
+version = "7.1.4"
+description = "Extensible memoizing collections and decorators"
+optional = true
+python-versions = ">=3.10"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "cachetools-7.1.4-py3-none-any.whl", hash = "sha256:323dc4127934744db5b54eb4924482d7edafbf9554e820d1531c2e08c0e4ef54"},
+    {file = "cachetools-7.1.4.tar.gz", hash = "sha256:437f55a4e0c1b01a4f3077cc470e6991d47430970e36fbcb77e2be0df4fc1cd6"},
+]
+
 [[package]]
 name = "certifi"
 version = "2026.5.20"
@@ -535,7 +588,7 @@ version = "3.4.7"
 description = "The Real First Universal Charset Detector. Open, modern and actively maintained alternative to Chardet."
 optional = false
 python-versions = ">=3.7"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "charset_normalizer-3.4.7-cp310-cp310-macosx_10_9_universal2.whl", hash = "sha256:cdd68a1fb318e290a2077696b7eb7a21a49163c455979c639bf5a5dcdc46617d"},
     {file = "charset_normalizer-3.4.7-cp310-cp310-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl", hash = "sha256:e17b8d5d6a8c47c85e68ca8379def1303fd360c3e22093a807cd34a71cd082b8"},
@@ -667,6 +720,7 @@ files = [
     {file = "charset_normalizer-3.4.7-py3-none-any.whl", hash = "sha256:3dce51d0f5e7951f8bb4900c257dad282f49190fdbebecd4ba99bcc41fef404d"},
     {file = "charset_normalizer-3.4.7.tar.gz", hash = "sha256:ae89db9e5f98a11a4bf50407d4363e7b09b31e55bc117b4f7d80aab97ba009e5"},
 ]
+markers = {main = "extra == \"web\""}
 
 [[package]]
 name = "click"
@@ -694,7 +748,7 @@ files = [
     {file = "colorama-0.4.6-py2.py3-none-any.whl", hash = "sha256:4f1d9991f5acc0ca119f9d443620b77f9d6b33703e51011c16baf57afb285fc6"},
     {file = "colorama-0.4.6.tar.gz", hash = "sha256:08695f5cb7ed6e0531a20572697297273c47b8cae5a63ffc6d6ed5c201be6e44"},
 ]
-markers = {main = "sys_platform == \"win32\" or platform_system == \"Windows\"", dev = "platform_system == \"Windows\" or sys_platform == \"win32\"", docs = "sys_platform == \"win32\""}
+markers = {main = "platform_system == \"Windows\" or sys_platform == \"win32\"", dev = "platform_system == \"Windows\" or sys_platform == \"win32\"", docs = "sys_platform == \"win32\""}
 
 [[package]]
 name = "comm"
@@ -1577,6 +1631,42 @@ files = [
     {file = "genson-1.3.0.tar.gz", hash = "sha256:e02db9ac2e3fd29e65b5286f7135762e2cd8a986537c075b06fc5f1517308e37"},
 ]
 
+[[package]]
+name = "gitdb"
+version = "4.0.12"
+description = "Git Object Database"
+optional = true
+python-versions = ">=3.7"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "gitdb-4.0.12-py3-none-any.whl", hash = "sha256:67073e15955400952c6565cc3e707c554a4eea2e428946f7a4c162fab9bd9bcf"},
+    {file = "gitdb-4.0.12.tar.gz", hash = "sha256:5ef71f855d191a3326fcfbc0d5da835f26b13fbcba60c32c21091c349ffdb571"},
+]
+
+[package.dependencies]
+smmap = ">=3.0.1,<6"
+
+[[package]]
+name = "gitpython"
+version = "3.1.51"
+description = "GitPython is a Python library used to interact with Git repositories"
+optional = true
+python-versions = ">=3.7"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "gitpython-3.1.51-py3-none-any.whl", hash = "sha256:d5b29685708f3c80a56db040b665bfd69492c8e150b5848532af8013b686c5a4"},
+    {file = "gitpython-3.1.51.tar.gz", hash = "sha256:22c9c94bb6b0b9f3c7157c684fece45a414cea204586b600beae6cd4570dcd6d"},
+]
+
+[package.dependencies]
+gitdb = ">=4.0.1,<5"
+
+[package.extras]
+doc = ["sphinx (>=7.4.7,<8)", "sphinx-autodoc-typehints", "sphinx_rtd_theme"]
+test = ["coverage[toml]", "ddt (>=1.1.1,!=1.4.3)", "mock ; python_version < \"3.8\"", "mypy (==1.18.2) ; python_version >= \"3.9\"", "pre-commit", "pytest (>=7.3.1)", "pytest-cov", "pytest-instafail", "pytest-mock", "pytest-sugar", "typing-extensions ; python_version < \"3.11\""]
+
 [[package]]
 name = "greenlet"
 version = "3.5.1"
@@ -1705,6 +1795,67 @@ http2 = ["h2 (>=3,<5)"]
 socks = ["socksio (==1.*)"]
 trio = ["trio (>=0.22.0,<1.0)"]
 
+[[package]]
+name = "httptools"
+version = "0.8.0"
+description = "A collection of framework independent HTTP protocol utils."
+optional = true
+python-versions = ">=3.9"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
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+    {file = "httptools-0.8.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:da684f2e1aa2ee9bdcb083f3f3a68c5956750b375bc5df864d3a5f0c42a40b77"},
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+    {file = "httptools-0.8.0-cp39-cp39-win_amd64.whl", hash = "sha256:5d7fa4ba7292c1139c0526f0b5aad507c6263c948206ea1b1cbca015c8af1b62"},
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+]
+
 [[package]]
 name = "httpx"
 version = "0.28.1"
@@ -1936,6 +2087,19 @@ files = [
 [package.extras]
 colors = ["colorama (>=0.4.6)"]
 
+[[package]]
+name = "itsdangerous"
+version = "2.2.0"
+description = "Safely pass data to untrusted environments and back."
+optional = true
+python-versions = ">=3.8"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "itsdangerous-2.2.0-py3-none-any.whl", hash = "sha256:c6242fc49e35958c8b15141343aa660db5fc54d4f13a1db01a3f5891b98700ef"},
+    {file = "itsdangerous-2.2.0.tar.gz", hash = "sha256:e0050c0b7da1eea53ffaf149c0cfbb5c6e2e2b69c4bef22c81fa6eb73e5f6173"},
+]
+
 [[package]]
 name = "jedi"
 version = "0.20.0"
@@ -1961,11 +2125,12 @@ version = "3.1.6"
 description = "A very fast and expressive template engine."
 optional = false
 python-versions = ">=3.7"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "jinja2-3.1.6-py3-none-any.whl", hash = "sha256:85ece4451f492d0c13c5dd7c13a64681a86afae63a5f347908daf103ce6d2f67"},
     {file = "jinja2-3.1.6.tar.gz", hash = "sha256:0137fb05990d35f1275a587e9aee6d56da821fc83491a0fb838183be43f66d6d"},
 ]
+markers = {main = "extra == \"web\""}
 
 [package.dependencies]
 MarkupSafe = ">=2.0"
@@ -2015,11 +2180,12 @@ version = "4.26.0"
 description = "An implementation of JSON Schema validation for Python"
 optional = false
 python-versions = ">=3.10"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "jsonschema-4.26.0-py3-none-any.whl", hash = "sha256:d489f15263b8d200f8387e64b4c3a75f06629559fb73deb8fdfb525f2dab50ce"},
     {file = "jsonschema-4.26.0.tar.gz", hash = "sha256:0c26707e2efad8aa1bfc5b7ce170f3fccc2e4918ff85989ba9ffa9facb2be326"},
 ]
+markers = {main = "extra == \"web\""}
 
 [package.dependencies]
 attrs = ">=22.2.0"
@@ -2046,11 +2212,12 @@ version = "2025.9.1"
 description = "The JSON Schema meta-schemas and vocabularies, exposed as a Registry"
 optional = false
 python-versions = ">=3.9"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "jsonschema_specifications-2025.9.1-py3-none-any.whl", hash = "sha256:98802fee3a11ee76ecaca44429fda8a41bff98b00a0f2838151b113f210cc6fe"},
     {file = "jsonschema_specifications-2025.9.1.tar.gz", hash = "sha256:b540987f239e745613c7a9176f3edb72b832a4ac465cf02712288397832b5e8d"},
 ]
+markers = {main = "extra == \"web\""}
 
 [package.dependencies]
 referencing = ">=0.31.0"
@@ -2464,7 +2631,7 @@ version = "3.0.3"
 description = "Safely add untrusted strings to HTML/XML markup."
 optional = false
 python-versions = ">=3.9"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "markupsafe-3.0.3-cp310-cp310-macosx_10_9_x86_64.whl", hash = "sha256:2f981d352f04553a7171b8e44369f2af4055f888dfb147d55e42d29e29e74559"},
     {file = "markupsafe-3.0.3-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:e1c1493fb6e50ab01d20a22826e57520f1284df32f2d8601fdd90b6304601419"},
@@ -2556,6 +2723,7 @@ files = [
     {file = "markupsafe-3.0.3-cp39-cp39-win_arm64.whl", hash = "sha256:38664109c14ffc9e7437e86b4dceb442b0096dfe3541d7864d9cbe1da4cf36c8"},
     {file = "markupsafe-3.0.3.tar.gz", hash = "sha256:722695808f4b6457b320fdc131280796bdceb04ab50fe1795cd540799ebe1698"},
 ]
+markers = {main = "extra == \"web\""}
 
 [[package]]
 name = "matplotlib"
@@ -2714,6 +2882,33 @@ files = [
     {file = "mypy_extensions-1.1.0.tar.gz", hash = "sha256:52e68efc3284861e772bbcd66823fde5ae21fd2fdb51c62a211403730b916558"},
 ]
 
+[[package]]
+name = "narwhals"
+version = "2.24.0"
+description = "Extremely lightweight compatibility layer between dataframe libraries"
+optional = true
+python-versions = ">=3.10"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "narwhals-2.24.0-py3-none-any.whl", hash = "sha256:42fdedf44e5b2ca7505630d45b4ac3058f38d8485cba9fe1652ca23152df7489"},
+    {file = "narwhals-2.24.0.tar.gz", hash = "sha256:b5c0f684ccd9d7475b564111e319a4964abcf2baf79d3cf6b1003d06ac9b828d"},
+]
+
+[package.extras]
+cudf = ["cudf-cu12 (>=24.10.0) ; sys_platform == \"linux\""]
+dask = ["dask[dataframe] (>=2024.8)"]
+duckdb = ["duckdb (>=1.1)"]
+ibis = ["ibis-framework (>=6.0.0)", "packaging (>=21.3)", "pyarrow-hotfix (>=0.7)"]
+modin = ["modin (>=0.22.0)"]
+pandas = ["pandas (>=1.3.4)"]
+polars = ["polars (>=0.20.4)"]
+pyarrow = ["pyarrow (>=13.0.0)"]
+pyspark = ["pyspark (>=3.5.0)"]
+pyspark-connect = ["pyspark[connect] (>=3.5.0)"]
+sql = ["narwhals[duckdb]", "sqlparse (>=0.5.5)"]
+sqlframe = ["sqlframe (>=3.22.0,!=3.39.3)"]
+
 [[package]]
 name = "nbclient"
 version = "0.10.4"
@@ -3150,7 +3345,7 @@ version = "12.2.0"
 description = "Python Imaging Library (fork)"
 optional = false
 python-versions = ">=3.10"
-groups = ["docs"]
+groups = ["main", "docs"]
 files = [
     {file = "pillow-12.2.0-cp310-cp310-macosx_10_10_x86_64.whl", hash = "sha256:a4e8f36e677d3336f35089648c8955c51c6d386a13cf6ee9c189c5f5bd713a9f"},
     {file = "pillow-12.2.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:2e589959f10d9824d39b350472b92f0ce3b443c0a3442ebf41c40cb8361c5b97"},
@@ -3244,6 +3439,7 @@ files = [
     {file = "pillow-12.2.0-pp311-pypy311_pp73-win_amd64.whl", hash = "sha256:bfa9c230d2fe991bed5318a5f119bd6780cda2915cca595393649fc118ab895e"},
     {file = "pillow-12.2.0.tar.gz", hash = "sha256:a830b1a40919539d07806aa58e1b114df53ddd43213d9c8b75847eee6c0182b5"},
 ]
+markers = {main = "extra == \"web\""}
 
 [package.extras]
 docs = ["furo", "olefile", "sphinx (>=8.2)", "sphinx-autobuild", "sphinx-copybutton", "sphinx-inline-tabs", "sphinxext-opengraph"]
@@ -3332,6 +3528,25 @@ files = [
 [package.dependencies]
 wcwidth = "*"
 
+[[package]]
+name = "protobuf"
+version = "7.35.1"
+description = ""
+optional = true
+python-versions = ">=3.10"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "protobuf-7.35.1-cp310-abi3-macosx_10_9_universal2.whl", hash = "sha256:24f857477359a85c0c235261b8ba905fd51b2562f4a64ca1df5473f29850cbf6"},
+    {file = "protobuf-7.35.1-cp310-abi3-manylinux2014_aarch64.whl", hash = "sha256:11d6b0ec246892d85215b0a13ca6e0233cf5284b68f0ac02646427f4ff88a799"},
+    {file = "protobuf-7.35.1-cp310-abi3-manylinux2014_s390x.whl", hash = "sha256:b73f9489a4b8b1c9cb1f8ed951c736392592edb24b9d6819f36d2e10b171d5b4"},
+    {file = "protobuf-7.35.1-cp310-abi3-manylinux2014_x86_64.whl", hash = "sha256:74758715c53d7158fb76caf4f0cfdacc5329a4b1bb994f865d6cf302d413a1c4"},
+    {file = "protobuf-7.35.1-cp310-abi3-win32.whl", hash = "sha256:353652e4efd0bca5b5fc2656abf8307ef351f0cf938c9eba09f0e09c20a25c30"},
+    {file = "protobuf-7.35.1-cp310-abi3-win_amd64.whl", hash = "sha256:230a75ddfc2de4806e56696ce9640c1cdfdb6543b7cfce98d42a4c0a0e7bdb87"},
+    {file = "protobuf-7.35.1-py3-none-any.whl", hash = "sha256:4bc97768d8fe4ad6743c8a19403e314511ed9f6d13205b687e52421c023ac1b9"},
+    {file = "protobuf-7.35.1.tar.gz", hash = "sha256:ce115a26fe0c39a2c29973d914d327e516a6455464489fe3cd1e51a1b354f81a"},
+]
+
 [[package]]
 name = "psutil"
 version = "7.2.2"
@@ -3635,6 +3850,27 @@ files = [
 [package.dependencies]
 typing-extensions = ">=4.14.1"
 
+[[package]]
+name = "pydeck"
+version = "0.9.3"
+description = "Widget for deck.gl maps"
+optional = true
+python-versions = ">=3.8"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "pydeck-0.9.3-py2.py3-none-any.whl", hash = "sha256:d8a47c11c81fb12d51b1feb42427ff4f0e13cb599e48931021b2cba98b6849a6"},
+    {file = "pydeck-0.9.3.tar.gz", hash = "sha256:695775cbfe51f5fdffbd9735ba469987fdc5efc96bc40a0ee4808170509c78b2"},
+]
+
+[package.dependencies]
+jinja2 = ">=2.10.1"
+numpy = ">=1.16.4"
+
+[package.extras]
+carto = ["pydeck-carto"]
+jupyter = ["ipykernel (>=5.1.2)", "ipywidgets (>=7,<8)", "traitlets (>=4.3.2)"]
+
 [[package]]
 name = "pyflakes"
 version = "2.5.0"
@@ -3872,30 +4108,16 @@ files = [
 dev = ["black", "build", "freezegun", "mdx_truly_sane_lists", "mike", "mkdocs", "mkdocs-awesome-pages-plugin", "mkdocs-gen-files", "mkdocs-literate-nav", "mkdocs-material (>=8.5)", "mkdocstrings[python]", "msgspec ; implementation_name != \"pypy\"", "mypy", "orjson ; implementation_name != \"pypy\"", "pylint", "pytest", "tzdata", "validate-pyproject[all]"]
 
 [[package]]
-name = "python-magic"
-version = "0.4.27"
-description = "File type identification using libmagic"
-optional = false
-python-versions = ">=2.7, !=3.0.*, !=3.1.*, !=3.2.*, !=3.3.*, !=3.4.*"
-groups = ["main"]
-markers = "sys_platform != \"win32\""
-files = [
-    {file = "python-magic-0.4.27.tar.gz", hash = "sha256:c1ba14b08e4a5f5c31a302b7721239695b2f0f058d125bd5ce1ee36b9d9d3c3b"},
-    {file = "python_magic-0.4.27-py2.py3-none-any.whl", hash = "sha256:c212960ad306f700aa0d01e5d7a325d20548ff97eb9920dcd29513174f0294d3"},
-]
-
-[[package]]
-name = "python-magic-bin"
-version = "0.4.14"
-description = "File type identification using libmagic binary package"
-optional = false
-python-versions = "*"
+name = "python-multipart"
+version = "0.0.32"
+description = "A streaming multipart parser for Python"
+optional = true
+python-versions = ">=3.10"
 groups = ["main"]
-markers = "sys_platform == \"win32\""
+markers = "extra == \"web\""
 files = [
-    {file = "python_magic_bin-0.4.14-py2.py3-none-macosx_10_6_intel.whl", hash = "sha256:7b1743b3dbf16601d6eedf4e7c2c9a637901b0faaf24ad4df4d4527e7d8f66a4"},
-    {file = "python_magic_bin-0.4.14-py2.py3-none-win32.whl", hash = "sha256:34a788c03adde7608028203e2dbb208f1f62225ad91518787ae26d603ae68892"},
-    {file = "python_magic_bin-0.4.14-py2.py3-none-win_amd64.whl", hash = "sha256:90be6206ad31071a36065a2fc169c5afb5e0355cbe6030e87641c6c62edc2b69"},
+    {file = "python_multipart-0.0.32-py3-none-any.whl", hash = "sha256:ff6d3f776f16878c894e52e107296ffc890e913c611b1a4ec6c44e2821fe2e23"},
+    {file = "python_multipart-0.0.32.tar.gz", hash = "sha256:be54b7f3fa167bb83e4fcd936b887b708f4e57fe75911c02aebf53efaf8d938e"},
 ]
 
 [[package]]
@@ -4131,11 +4353,12 @@ version = "0.37.0"
 description = "JSON Referencing + Python"
 optional = false
 python-versions = ">=3.10"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "referencing-0.37.0-py3-none-any.whl", hash = "sha256:381329a9f99628c9069361716891d34ad94af76e461dcb0335825aecc7692231"},
     {file = "referencing-0.37.0.tar.gz", hash = "sha256:44aefc3142c5b842538163acb373e24cce6632bd54bdb01b21ad5863489f50d8"},
 ]
+markers = {main = "extra == \"web\""}
 
 [package.dependencies]
 attrs = ">=22.2.0"
@@ -4272,11 +4495,12 @@ version = "2.34.2"
 description = "Python HTTP for Humans."
 optional = false
 python-versions = ">=3.10"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "requests-2.34.2-py3-none-any.whl", hash = "sha256:2a0d60c172f83ac6ab31e4554906c0f3b3588d37b5cb939b1c061f4907e278e0"},
     {file = "requests-2.34.2.tar.gz", hash = "sha256:f288924cae4e29463698d6d60bc6a4da69c89185ad1e0bcc4104f584e960b9ed"},
 ]
+markers = {main = "extra == \"web\""}
 
 [package.dependencies]
 certifi = ">=2023.5.7"
@@ -4358,7 +4582,7 @@ version = "0.30.0"
 description = "Python bindings to Rust's persistent data structures (rpds)"
 optional = false
 python-versions = ">=3.10"
-groups = ["dev", "docs"]
+groups = ["main", "dev", "docs"]
 files = [
     {file = "rpds_py-0.30.0-cp310-cp310-macosx_10_12_x86_64.whl", hash = "sha256:679ae98e00c0e8d68a7fda324e16b90fd5260945b45d3b824c892cec9eea3288"},
     {file = "rpds_py-0.30.0-cp310-cp310-macosx_11_0_arm64.whl", hash = "sha256:4cc2206b76b4f576934f0ed374b10d7ca5f457858b157ca52064bdfc26b9fc00"},
@@ -4476,6 +4700,7 @@ files = [
     {file = "rpds_py-0.30.0-pp311-pypy311_pp73-musllinux_1_2_x86_64.whl", hash = "sha256:ac37f9f516c51e5753f27dfdef11a88330f04de2d564be3991384b2f3535d02e"},
     {file = "rpds_py-0.30.0.tar.gz", hash = "sha256:dd8ff7cf90014af0c0f787eea34794ebf6415242ee1d6fa91eaba725cc441e84"},
 ]
+markers = {main = "extra == \"web\""}
 
 [[package]]
 name = "s3transfer"
@@ -4578,6 +4803,19 @@ files = [
     {file = "six-1.17.0.tar.gz", hash = "sha256:ff70335d468e7eb6ec65b95b99d3a2836546063f63acc5171de367e834932a81"},
 ]
 
+[[package]]
+name = "smmap"
+version = "5.0.3"
+description = "A pure Python implementation of a sliding window memory map manager"
+optional = true
+python-versions = ">=3.7"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "smmap-5.0.3-py3-none-any.whl", hash = "sha256:c106e05d5a61449cf6ba9a1e650227ecfb141590d2a98412103ff35d89fc7b2f"},
+    {file = "smmap-5.0.3.tar.gz", hash = "sha256:4d9debb8b99007ae47165abc08670bd74cb74b5227dda7f643eccc4e9eb5642c"},
+]
+
 [[package]]
 name = "snowballstemmer"
 version = "3.1.0"
@@ -4901,6 +5139,91 @@ files = [
     {file = "standard_imghdr-3.13.0.tar.gz", hash = "sha256:8d9c68058d882f6fc3542a8d39ef9ff94d2187dc90bd0c851e0902776b7b7a42"},
 ]
 
+[[package]]
+name = "starlette"
+version = "1.3.1"
+description = "The little ASGI library that shines."
+optional = true
+python-versions = ">=3.10"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "starlette-1.3.1-py3-none-any.whl", hash = "sha256:c7372aae11c3c3f26a42df7bd626cec2f47d03483d261d369516a615a53714c6"},
+    {file = "starlette-1.3.1.tar.gz", hash = "sha256:05d0213193f2fbaae60e2ecb593b4add4262ad4e46536b54abe36f11a71724e0"},
+]
+
+[package.dependencies]
+anyio = ">=3.6.2,<5"
+typing-extensions = {version = ">=4.10.0", markers = "python_version < \"3.13\""}
+
+[package.extras]
+full = ["httpx (>=0.27.0,<0.29.0)", "httpx2 (>=2.0.0)", "itsdangerous", "jinja2", "python-multipart (>=0.0.18)", "pyyaml"]
+
+[[package]]
+name = "streamlit"
+version = "1.59.2"
+description = "A faster way to build and share data apps"
+optional = true
+python-versions = ">=3.10"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "streamlit-1.59.2-py3-none-any.whl", hash = "sha256:5014cb4f0064bd16c58fe334cb0d3c4b7e2be3d1ce4c02202c07114a33576dab"},
+    {file = "streamlit-1.59.2.tar.gz", hash = "sha256:8fcb35df152868d33eec7ad2d89e276499a5351fb861eb1752b76476be7eb582"},
+]
+
+[package.dependencies]
+altair = ">=4.0,<5.4.0 || >5.4.0,<5.4.1 || >5.4.1,<7"
+anyio = ">=4.0.0"
+blinker = ">=1.5.0,<2"
+cachetools = ">=5.5,<8"
+click = ">=7.0,<9"
+gitpython = ">=3.0.7,<3.1.19 || >3.1.19,<4"
+httptools = ">=0.6.3"
+itsdangerous = ">=2.1.2"
+numpy = ">=1.23,<3"
+packaging = ">=20"
+pandas = ">=1.4.0,<4"
+pillow = ">=7.1.0,<13"
+protobuf = ">=3.20,<8"
+pyarrow = ">=7.0,<25"
+pydeck = ">=0.8.0b4,<1"
+python-multipart = ">=0.0.10"
+requests = ">=2.27,<3"
+starlette = ">=0.40.0"
+tenacity = ">=8.1.0,<10"
+toml = ">=0.10.1,<2"
+typing-extensions = ">=4.10.0,<5"
+uvicorn = ">=0.30.0"
+watchdog = {version = ">=2.1.5,<7", markers = "platform_system != \"Darwin\""}
+websockets = ">=12.0.0"
+
+[package.extras]
+all = ["rich (>=11.0.0)", "streamlit[auth,charts,pdf,performance,snowflake,sql]"]
+auth = ["Authlib (>=1.3.2)", "httpx (>=0.24.1)"]
+charts = ["graphviz (>=0.19.0)", "matplotlib (>=3.0.0)", "orjson (>=3.5.0)", "plotly (>=4.0.0)"]
+pdf = ["streamlit-pdf (>=1.0.0)"]
+performance = ["orjson (>=3.5.0)", "uvloop (>=0.15.2) ; sys_platform != \"win32\" and sys_platform != \"cygwin\" and platform_python_implementation != \"PyPy\""]
+snowflake = ["snowflake-connector-python (>=3.3.0)", "snowflake-snowpark-python[modin] (>=1.17.0)"]
+sql = ["SQLAlchemy (>=2.0.0)"]
+
+[[package]]
+name = "tenacity"
+version = "9.1.4"
+description = "Retry code until it succeeds"
+optional = true
+python-versions = ">=3.10"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "tenacity-9.1.4-py3-none-any.whl", hash = "sha256:6095a360c919085f28c6527de529e76a06ad89b23659fa881ae0649b867a9d55"},
+    {file = "tenacity-9.1.4.tar.gz", hash = "sha256:adb31d4c263f2bd041081ab33b498309a57c77f9acf2db65aadf0898179cf93a"},
+]
+
+[package.extras]
+doc = ["reno", "sphinx"]
+test = ["pytest", "tornado (>=4.5)", "typeguard"]
+
 [[package]]
 name = "terminado"
 version = "0.18.1"
@@ -4942,6 +5265,19 @@ webencodings = ">=0.4"
 doc = ["sphinx", "sphinx_rtd_theme"]
 test = ["pytest", "ruff"]
 
+[[package]]
+name = "toml"
+version = "0.10.2"
+description = "Python Library for Tom's Obvious, Minimal Language"
+optional = true
+python-versions = ">=2.6, !=3.0.*, !=3.1.*, !=3.2.*"
+groups = ["main"]
+markers = "extra == \"web\""
+files = [
+    {file = "toml-0.10.2-py2.py3-none-any.whl", hash = "sha256:806143ae5bfb6a3c6e736a764057db0e6a0e05e338b5630894a5f779cabb4f9b"},
+    {file = "toml-0.10.2.tar.gz", hash = "sha256:b3bda1d108d5dd99f4a20d24d9c348e91c4db7ab1b749200bded2f839ccbe68f"},
+]
+
 [[package]]
 name = "tomli"
 version = "2.4.1"
@@ -5193,6 +5529,26 @@ h2 = ["h2 (>=4,<5)"]
 socks = ["pysocks (>=1.5.6,!=1.5.7,<2.0)"]
 zstd = ["backports-zstd (>=1.0.0) ; python_version < \"3.14\""]
 
+[[package]]
+name = "uvicorn"
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 version = "21.3.3"
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 platformdirs = ">=3.9.1,<5"
 python-discovery = ">=1.3.1"
 
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 [[package]]
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 version = "0.7.0"
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 optional = ["python-socks", "wsaccel"]
 test = ["pytest", "websockets"]
 
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+    {file = "websockets-16.1-cp314-cp314t-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl", hash = "sha256:4a6db7972d52bc1b66cefe2246902e256cbaebc9ba8a45eac09343d7eb6671b2"},
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+    {file = "websockets-16.1-cp314-cp314t-manylinux2014_ppc64le.manylinux_2_17_ppc64le.manylinux_2_28_ppc64le.whl", hash = "sha256:9cb074d150e4ad2a77aa8a332c2be85f3f64f2681519d2570c1225c12c9821ff"},
+    {file = "websockets-16.1-cp314-cp314t-manylinux2014_s390x.manylinux_2_17_s390x.manylinux_2_28_s390x.whl", hash = "sha256:d19c9067e1fe9490f974bffbc0e443b80a7674c5efb4980c429cc00771f07c5a"},
+    {file = "websockets-16.1-cp314-cp314t-manylinux_2_31_riscv64.manylinux_2_39_riscv64.whl", hash = "sha256:d440ff0c6c7469ad59c0a412c383c235935b43635e89425e3f6a0c36de90c31b"},
+    {file = "websockets-16.1-cp314-cp314t-musllinux_1_2_aarch64.whl", hash = "sha256:8613129a2533f08de24505e69a3e403cedaadae49abdb043c4d170ca71b7e4bd"},
+    {file = "websockets-16.1-cp314-cp314t-musllinux_1_2_armv7l.whl", hash = "sha256:a5bf9c23f197b4ec88290fd5463f33db67362a1bb10f85fc2e8e7627f0ddab97"},
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+    {file = "websockets-16.1-cp314-cp314t-musllinux_1_2_riscv64.whl", hash = "sha256:7143aa09a67e1c013be44e81a88dfe90fc6244198ab86c7edd064152cf619805"},
+    {file = "websockets-16.1-cp314-cp314t-musllinux_1_2_s390x.whl", hash = "sha256:7acb811fad08e611755800d1560e395c67e11a6bd563598ea6abb319afb86938"},
+    {file = "websockets-16.1-cp314-cp314t-musllinux_1_2_x86_64.whl", hash = "sha256:c5cf88e3faa2f7931bc6baeee7599c97656a3f6ac7f831f4fccba233e141783a"},
+    {file = "websockets-16.1-cp314-cp314t-win32.whl", hash = "sha256:589f8842521c8307684ce0b40ce4ad70c5e0aa46484c6f1225a94ef4b8970341"},
+    {file = "websockets-16.1-cp314-cp314t-win_amd64.whl", hash = "sha256:2c0e0857c30bbbc2bb5c30687508f0b7ec19aa026cd9f2ff8424d0fee42dcc07"},
+    {file = "websockets-16.1-pp311-pypy311_pp73-macosx_10_15_x86_64.whl", hash = "sha256:7289d899c79e763e6221c8dcb8959361cb43274418538d7c7ad16a43b01d12f9"},
+    {file = "websockets-16.1-pp311-pypy311_pp73-macosx_11_0_arm64.whl", hash = "sha256:e22e9e3719f5131bd62da4db63c8da63eb8c91cc99e16c1cbd122f130e1ae07a"},
+    {file = "websockets-16.1-pp311-pypy311_pp73-manylinux1_x86_64.manylinux_2_28_x86_64.manylinux_2_5_x86_64.whl", hash = "sha256:83bdabafef431247e6b11a9aab8a0893fd8e82e1ed95b32e0373625b03ffce4a"},
+    {file = "websockets-16.1-pp311-pypy311_pp73-manylinux2014_aarch64.manylinux_2_17_aarch64.manylinux_2_28_aarch64.whl", hash = "sha256:0b8d13ceabc5c60995f201b5211d76876e17e68706ebf5d3bc666b32eefff1a6"},
+    {file = "websockets-16.1-pp311-pypy311_pp73-win_amd64.whl", hash = "sha256:81495f9c0085361c582efbc3207fb877174cfe03370f17d9cd70624404aa526f"},
+    {file = "websockets-16.1-py3-none-any.whl", hash = "sha256:c5149dfe490ec7e5ee5dbf624c642fb725f93a5575c7f00ab594ca9eddb8dd81"},
+    {file = "websockets-16.1.tar.gz", hash = "sha256:299468cbe42e2b9981134c7c51d99387d8a7bf562b00183b3eec53f882846dad"},
+]
+
 [[package]]
 name = "win32-setctime"
 version = "1.2.0"
@@ -5281,9 +5801,9 @@ files = [
 dev = ["black (>=19.3b0) ; python_version >= \"3.6\"", "pytest (>=4.6.2)"]
 
 [extras]
-web = []
+web = ["streamlit"]
 
 [metadata]
 lock-version = "2.1"
 python-versions = ">=3.11,<3.14"
-content-hash = "1036baf1ddcc1e53fab8f168ad5ce713f85370f19d46462af0b36e360be37733"
+content-hash = "9bf808065543441f012b9c6c05e4911888c1e89102b6b2a0d0a9653e783b449b"
diff --git a/pyproject.toml b/pyproject.toml
index c355ba28..219c1271 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -30,8 +30,6 @@ pydantic = "^2.12.5"
 duckdb = "^1.4.4"
 duckdb-engine = "^0.17.0"
 sqlalchemy = "^2.0.48"
-python-magic = { version = "*", platform = "!=win32" }
-python-magic-bin = { version = "*", platform = "win32" }
 chardet = "^7.4.0.post2"
 anyio = "^4.13.0"
 httpx = ">=0.28.0"
@@ -43,6 +41,7 @@ dotenv = "^0.9.9"
 boto3 = "^1.42.89"
 typer = "^0.24.1"
 humanize = "^4.8.0"
+streamlit = {version = ">=1.30.0", optional = true}
 
 [tool.poetry.extras]
 web = ["streamlit"]
diff --git a/pysus/api/extensions.py b/pysus/api/extensions.py
index ed82ab33..b561b0e8 100644
--- a/pysus/api/extensions.py
+++ b/pysus/api/extensions.py
@@ -3,8 +3,8 @@
 import asyncio
 import csv
 import gzip
+import json
 import shutil
-import sys
 import tarfile
 import zipfile
 from collections.abc import AsyncGenerator, Callable
@@ -129,11 +129,15 @@ class CSV(BaseTabularFile):
     type: FileType = Field("CSV")
     _encoding: str | None = PrivateAttr(default=None)
     _sep: str | None = PrivateAttr(default=None)
+    _columns_cache: list["Column"] | None = PrivateAttr(default=None)
+    _rows_cache: int | None = PrivateAttr(default=None)
 
     @property
     def columns(self) -> list["Column"]:
         """Return the column metadata from the CSV header row."""
 
+        if self._columns_cache is not None:
+            return self._columns_cache
         if self._encoding is not None:
             enc = self._encoding
         else:
@@ -146,20 +150,39 @@ def columns(self) -> list["Column"]:
                 else raw_enc
             )
             self._encoding = enc
-        df = pd.read_csv(self.path, sep=",", nrows=0, encoding=enc)
-        return [
+        if self._sep is not None:
+            sep = self._sep
+        else:
+            try:
+                with open(self.path, encoding=enc) as f:
+                    sample = f.read(1024 * 10)
+                    dialect = csv.Sniffer().sniff(sample)
+                    sep = dialect.delimiter
+            except ValueError:
+                sep = ","
+            self._sep = sep
+        df = pd.read_csv(self.path, sep=sep, nrows=0, encoding=enc)
+        result = [
             Column.from_schema(name=col, dtype=_map_dtype(str(dt)))
             for col, dt in zip(df.columns, df.dtypes)
         ]
+        self._columns_cache = result
+        return result
 
     @property
     def rows(self) -> int:
         """Return the number of data rows in the file."""
+        if self._rows_cache is not None:
+            return self._rows_cache
         count = 0
         with open(self.path, "rb") as f:
-            for _ in f:
+            reader = csv.reader(
+                line.decode("latin-1", errors="replace") for line in f
+            )
+            for _ in reader:
                 count += 1
-        return max(0, count - 1)
+        self._rows_cache = max(0, count - 1)
+        return self._rows_cache
 
     async def _get_encoding(self) -> str:
         """Detect and cache the file's character encoding."""
@@ -238,28 +261,40 @@ class Parquet(BaseTabularFile):
 
     type: FileType = Field("PARQUET")
     add_dv: bool = True
+    _schema_cache: pa.Schema | None = PrivateAttr(default=None)
+    _metadata_cache: object | None = PrivateAttr(default=None)
+    _columns_cache: list["Column"] | None = PrivateAttr(default=None)
+    _rows_cache: int | None = PrivateAttr(default=None)
 
     @property
     def schema(self) -> pa.Schema:
         """Return the Parquet schema as a PyArrow Schema object."""
-        return pq.read_schema(self.path)
+        if self._schema_cache is None:
+            self._schema_cache = pq.read_schema(self.path)
+        return self._schema_cache
 
     @property
     def columns(self) -> list["Column"]:
         """Return the column metadata from the Parquet schema."""
 
-        schema = pq.read_schema(self.path)
-        return [
+        if self._columns_cache is not None:
+            return self._columns_cache
+        result = [
             Column.from_schema(
                 name=field.name, dtype=_map_dtype(str(field.type))
             )
-            for field in schema
+            for field in self.schema
         ]
+        self._columns_cache = result
+        return result
 
     @property
     def rows(self) -> int:
         """Return the number of rows from the Parquet metadata."""
-        return pq.read_metadata(self.path).num_rows
+        if self._rows_cache is not None:
+            return self._rows_cache
+        self._rows_cache = pq.read_metadata(self.path).num_rows
+        return self._rows_cache
 
     @staticmethod
     def _apply_add_dv(df: pd.DataFrame) -> pd.DataFrame:
@@ -341,51 +376,46 @@ class DBF(BaseTabularFile):
     """Represents a dBASE (DBF) file."""
 
     type: FileType = Field("DBF")
+    _columns_cache: list["Column"] | None = PrivateAttr(default=None)
+    _rows_cache: int | None = PrivateAttr(default=None)
 
     @property
     def columns(self) -> list["Column"]:
         """Return the column metadata from the DBF file."""
 
+        if self._columns_cache is not None:
+            return self._columns_cache
         try:
             schema = read_dbf_schema(self.path)
-        except Exception:  # noqa: B902 — fallback to dbfread
+        except Exception:  # noqa: BLE001
             reader = DBFReader(self.path, load=False)
-            _DBF_DTYPE = {
-                "C": "VARCHAR",
-                "N": "INTEGER",
-                "F": "FLOAT",
-                "D": "DATE",
-                "L": "BOOLEAN",
-                "M": "VARCHAR",
-            }
-            return [
+            result = [
                 Column.from_schema(
                     name=f.name, dtype=_DBF_DTYPE.get(f.type, "VARCHAR")
                 )
                 for f in reader.fields
             ]
-        _DBF_DTYPE = {
-            "C": "VARCHAR",
-            "N": "INTEGER",
-            "F": "FLOAT",
-            "D": "DATE",
-            "L": "BOOLEAN",
-            "M": "VARCHAR",
-        }
-        return [
-            Column.from_schema(
-                name=f.name, dtype=_DBF_DTYPE.get(f.type_, "VARCHAR")
-            )
-            for f in schema.fields
-        ]
+        else:
+            result = [
+                Column.from_schema(
+                    name=f.name,
+                    dtype=_DBF_DTYPE.get(f.type_, "VARCHAR"),
+                )
+                for f in schema.fields
+            ]
+        self._columns_cache = result
+        return result
 
     @property
     def rows(self) -> int:
         """Return the number of records in the DBF file."""
+        if self._rows_cache is not None:
+            return self._rows_cache
         try:
-            return read_dbf_schema(self.path).num_records
-        except Exception:  # noqa: B902 — fallback to dbfread
-            return len(DBFReader(self.path, load=False))
+            self._rows_cache = read_dbf_schema(self.path).num_records
+        except Exception:  # noqa: BLE001
+            self._rows_cache = len(DBFReader(self.path, load=False))
+        return self._rows_cache
 
     def decode_column(self, value):
         """Decode a raw DBF value, handling byte strings and null bytes.
@@ -596,7 +626,9 @@ async def _to_parquet_dbfread(
                     callback(total_rows, total_rows)
 
             if writer is None:
-                df_empty = pd.DataFrame(columns=pd.Index(self.columns))
+                df_empty = pd.DataFrame(
+                    columns=pd.Index([c.name for c in self.columns])
+                )
                 table_empty = pa.Table.from_pandas(df_empty)
                 writer = pq.ParquetWriter(str(out), table_empty.schema)
 
@@ -701,11 +733,21 @@ class JSON(BaseTabularFile):
     def columns(self) -> list["Column"]:
         """Return the column metadata from the JSON file."""
 
-        df = (
-            pd.read_json(self.path, nrows=0)
-            if self.path.stat().st_size > 0
-            else pd.DataFrame()
-        )
+        if self.path.stat().st_size == 0:
+            return []
+        with open(self.path, encoding="utf-8") as f:
+            data = json.load(f)
+        if (
+            isinstance(data, list)
+            and len(data) > 0
+            and isinstance(data[0], dict)
+        ):
+            sample = data[0]
+        elif isinstance(data, dict):
+            sample = data
+        else:
+            return []
+        df = pd.DataFrame([sample])
         return [
             Column.from_schema(name=col, dtype=_map_dtype(str(dt)))
             for col, dt in zip(df.columns, df.dtypes)
@@ -797,7 +839,19 @@ async def extract(
 
         def _extract_sync():
             """Extract ZIP contents synchronously in a thread."""
+            root = target_dir.resolve()
             with zipfile.ZipFile(self.path) as z:
+                for info in z.infolist():
+                    unix_mode = info.external_attr >> 16
+                    if unix_mode and unix_mode & 0o170000 == 0o120000:
+                        raise ValueError(f"Symlink blocked: {info.filename}")
+                    member_path = (target_dir / info.filename).resolve()
+                    try:
+                        member_path.relative_to(root)
+                    except ValueError:
+                        raise ValueError(
+                            f"Path traversal blocked: {info.filename}"
+                        )
                 z.extractall(target_dir)
 
         await to_thread.run_sync(_extract_sync)
@@ -844,22 +898,19 @@ async def to_parquet(
     async def _safe_cleanup(self, directory: Path):
         """Remove a temporary directory and its contents."""
 
-        def _cleanup():
-            """Remove directory contents synchronously in a thread."""
-            if not directory.exists():
-                return
-
-            for item in directory.iterdir():
-                if item.is_file():
-                    item.unlink()
-                elif item.is_dir():
-                    for subitem in item.iterdir():
-                        if subitem.is_file():
-                            subitem.unlink()
-                    item.rmdir()
+        def _rmdir_recursive(d: Path):
+            """Recursively remove a directory tree."""
+            for item in d.iterdir():
+                if item.is_dir():
+                    _rmdir_recursive(item)
+                else:
+                    item.unlink(missing_ok=True)
+            d.rmdir()
 
+        def _cleanup():
+            """Remove directory synchronously in a thread."""
             if directory.exists():
-                directory.rmdir()
+                _rmdir_recursive(directory)
 
         await to_thread.run_sync(_cleanup)
 
@@ -867,7 +918,7 @@ def _cleanup():
 class GZip(BaseCompressedFile):
     """Represents a GZip-compressed file."""
 
-    type: FileType = Field("ZIP")
+    type: FileType = Field("GZIP")
 
     async def load(self) -> bytes:
         """Decompress and read the entire file contents into memory."""
@@ -916,7 +967,7 @@ def _decompress():
 class Tar(BaseCompressedFile):
     """Represents a Tar archive file."""
 
-    type: FileType = Field("ZIP")
+    type: FileType = Field("TAR")
 
     async def load(self) -> tarfile.TarFile:
         """Open and return the tar archive."""
@@ -955,7 +1006,20 @@ async def extract(
 
         def _extract():
             """Extract Tar contents synchronously in a thread."""
+            root = target_dir.resolve()
             with tarfile.open(self.path) as t:
+                for member in t.getmembers():
+                    if member.issym() or member.islnk():
+                        raise ValueError(
+                            f"Symlink/hardlink blocked: {member.name}"
+                        )
+                    member_path = (target_dir / member.name).resolve()
+                    try:
+                        member_path.relative_to(root)
+                    except ValueError:
+                        raise ValueError(
+                            f"Path traversal blocked: {member.name}"
+                        )
                 t.extractall(target_dir)
 
         await to_thread.run_sync(_extract)
@@ -963,17 +1027,118 @@ def _extract():
         return list(await asyncio.gather(*tasks))
 
 
+_DBF_SIGNATURES = frozenset(
+    {0x02, 0x03, 0x04, 0x05, 0x30, 0x31, 0x43, 0x63, 0x83, 0x8B, 0x8E, 0xF5}
+)
+
+_DBF_DTYPE = {
+    "C": "VARCHAR",
+    "N": "INTEGER",
+    "F": "FLOAT",
+    "D": "DATE",
+    "L": "BOOLEAN",
+    "M": "VARCHAR",
+}
+
+
+def _detect_parquet(path: Path, header: bytes) -> type[Parquet] | None:
+    if header[:4] != b"PAR1":
+        return None
+    try:
+        pq.read_metadata(str(path))
+        return Parquet
+    except Exception:  # noqa: BLE001
+        return None
+
+
+def _detect_pdf(path: Path, header: bytes) -> type[PDF] | None:
+    if header[:5] == b"%PDF-":
+        return PDF
+    return None
+
+
+def _detect_zip(path: Path, header: bytes) -> type[Zip] | None:
+    if header[:4] in (
+        b"PK\x03\x04",
+        b"PK\x05\x06",
+        b"PK\x07\x08",
+    ):
+        if zipfile.is_zipfile(path):
+            return Zip
+    return None
+
+
+def _detect_gzip(path: Path, header: bytes) -> type[GZip] | None:
+    if header[:2] != b"\x1f\x8b":
+        return None
+    try:
+        with gzip.open(path) as f:
+            f.read(1)
+        return GZip
+    except OSError:
+        return None
+
+
+def _detect_tar(path: Path, header: bytes) -> type[Tar] | None:
+    if len(header) >= 262 and header[257:262] == b"ustar":
+        if tarfile.is_tarfile(path):
+            return Tar
+    return None
+
+
+def _detect_dbf(path: Path, header: bytes) -> type[DBF] | None:
+    if not header or header[0] not in _DBF_SIGNATURES:
+        return None
+    try:
+        schema = read_dbf_schema(path)
+        expected_size = (
+            schema.header_len + schema.num_records * schema.record_len
+        )
+        actual_size = path.stat().st_size
+        if expected_size <= actual_size + schema.record_len:
+            return DBF
+    except Exception:  # noqa: BLE001
+        pass
+    return None
+
+
+def _detect_json(path: Path, header: bytes) -> type[JSON] | None:
+    prefix = header.lstrip()
+    if prefix[:1] not in (b"{", b"["):
+        return None
+    try:
+        json.loads(prefix)
+        return JSON
+    except (UnicodeDecodeError, json.JSONDecodeError):
+        return None
+
+
+_DETECTORS = [
+    _detect_parquet,
+    _detect_pdf,
+    _detect_zip,
+    _detect_gzip,
+    _detect_tar,
+    _detect_dbf,
+    _detect_json,
+]
+
+
+def _detect_type(path: Path) -> type[BaseLocalFile] | None:
+    try:
+        with open(path, "rb") as f:
+            header = f.read(4096)
+    except OSError:
+        return None
+    for detector in _DETECTORS:
+        result = detector(path, header)
+        if result is not None:
+            return result
+    return None
+
+
 class ExtensionFactory:
-    """Factory that maps file extensions and MIME types to handler classes."""
-
-    _mime: dict[str, type[BaseLocalFile]] = {
-        "application/zip": Zip,
-        "application/x-gzip": GZip,
-        "application/x-tar": Tar,
-        "text/csv": CSV,
-        "application/pdf": PDF,
-        "application/json": JSON,
-    }
+    """Factory that maps file content and extensions to handler classes."""
 
     _extensions: dict[str, type[BaseLocalFile]] = {
         ".zip": Zip,
@@ -989,33 +1154,34 @@ class ExtensionFactory:
         ".json": JSON,
     }
 
-    _magic_available: bool = sys.platform != "win32"
+    _detection_cache: dict[str, type[BaseLocalFile] | None] = {}
+
+    @classmethod
+    def _cache_key(cls, path: Path) -> str:
+        stat = path.stat()
+        return f"{path.resolve()}:{stat.st_size}:{stat.st_mtime_ns}"
 
     @classmethod
     async def _identify(cls, path: Path) -> type[BaseLocalFile] | None:
-        """Identify the file class by its MIME type."""
-        if not cls._magic_available:
-            return None
+        """Identify the file type by attempting to parse it."""
         try:
-            import magic
-        except (ImportError, OSError):
-            cls._magic_available = False
+            key = cls._cache_key(path)
+        except OSError:
             return None
+        if key in cls._detection_cache:
+            return cls._detection_cache[key]
         try:
-            mime = await to_thread.run_sync(
-                magic.from_file,
-                str(path),
-                True,
-            )
-            return cls._mime.get(mime)
-        except (magic.MagicException, OSError):
-            return None
+            result = await to_thread.run_sync(_detect_type, path)
+        except OSError:
+            result = None
+        cls._detection_cache[key] = result
+        return result
 
     @classmethod
     async def get_file_class(cls, path: Path) -> type[BaseLocalFile]:
-        """Return the file handler class for a given path.
+        """Return the handler class for a given path.
 
-        First attempts MIME-type identification; falls back to extension
+        First attempts content-based identification; falls back to extension
         matching.
 
         Parameters
diff --git a/pysus/api/types.py b/pysus/api/types.py
index 14d37015..ce940d73 100644
--- a/pysus/api/types.py
+++ b/pysus/api/types.py
@@ -49,6 +49,8 @@ def _validate_file_type(v: str) -> str:
         "DBC",
         "DBF",
         "ZIP",
+        "TAR",
+        "GZIP",
     )
     assert v in valid, f"Invalid file type: {v!r}"
     return v
diff --git a/pysus/tests/api/test_extensions.py b/pysus/tests/api/test_extensions.py
index 3879eac2..02378bc7 100644
--- a/pysus/tests/api/test_extensions.py
+++ b/pysus/tests/api/test_extensions.py
@@ -1,4 +1,3 @@
-import builtins
 import gzip
 import json
 import struct
@@ -691,8 +690,9 @@ async def test_dbf_to_parquet_non_parquet_extension(tmp_dir):
     obj = DBF(path=dbf_path)
 
     out = tmp_dir / "out.custom"
-    with pytest.raises(ConversionError, match="Could not parse"):
-        await obj.to_parquet(output_path=out)
+    result = await obj.to_parquet(output_path=out)
+    assert isinstance(result, Parquet)
+    assert out.exists()
 
 
 # ---------------------------------------------------------------------------
@@ -772,8 +772,10 @@ def test_json_columns(tmp_dir):
     path = tmp_dir / "data.json"
     path.write_text('[{"a": 1, "b": "x"}]')
     obj = JSON(path=path)
-    with pytest.raises(ValueError, match="nrows can only be passed"):
-        _ = obj.columns
+    cols = obj.columns
+    assert len(cols) == 2
+    assert cols[0].name == "a"
+    assert cols[1].name == "b"
 
 
 def test_json_columns_empty(tmp_dir):
@@ -924,63 +926,130 @@ async def test_tar_load(tmp_dir):
 
 
 @pytest.mark.asyncio
-async def test_extension_factory_identify_magic_not_available(tmp_dir):
-    orig = ExtensionFactory._magic_available
-    ExtensionFactory._magic_available = False
-    try:
-        path = tmp_dir / "test.csv"
-        path.write_text("a,b\n1,2")
-        result = await ExtensionFactory._identify(path)
-        assert result is None
-    finally:
-        ExtensionFactory._magic_available = orig
+async def test_extension_factory_identify_oserror(tmp_dir):
+    path = tmp_dir / "nonexistent.csv"
+    result = await ExtensionFactory._identify(path)
+    assert result is None
 
 
 @pytest.mark.asyncio
-async def test_extension_factory_identify_magic_import_error(
-    monkeypatch, tmp_dir
-):
-    orig_available = ExtensionFactory._magic_available
-    ExtensionFactory._magic_available = True
-    try:
-        path = tmp_dir / "test.csv"
-        path.write_text("a,b\n1,2")
+async def test_extension_factory_identify_csv_falls_back(tmp_dir):
+    path = tmp_dir / "test.csv"
+    path.write_text("a,b\n1,2")
+    result = await ExtensionFactory._identify(path)
+    assert result is None
+    cls = await ExtensionFactory.get_file_class(path)
+    assert cls is CSV
 
-        original_import = builtins.__import__
 
-        def mock_import(name, globals=None, locals=None, fromlist=(), level=0):
-            if name == "magic":
-                raise ImportError("Mock error")
-            return original_import(name, globals, locals, fromlist, level)
+@pytest.mark.asyncio
+async def test_extension_factory_identify_zip(tmp_dir):
+    path = tmp_dir / "test.zip"
+    with zipfile.ZipFile(path, "w") as zf:
+        zf.writestr("file.txt", "hello")
+    result = await ExtensionFactory._identify(path)
+    assert result is Zip
 
-        monkeypatch.setattr(builtins, "__import__", mock_import)
 
-        result = await ExtensionFactory._identify(path)
-        assert result is None
-        assert not ExtensionFactory._magic_available
-    finally:
-        ExtensionFactory._magic_available = orig_available
+@pytest.mark.asyncio
+async def test_extension_factory_identify_gzip(tmp_dir):
+    path = tmp_dir / "test.gz"
+    with gzip.open(path, "wb") as f:
+        f.write(b"hello")
+    result = await ExtensionFactory._identify(path)
+    assert result is GZip
 
 
 @pytest.mark.asyncio
-async def test_extension_factory_identify_magic_exception(monkeypatch, tmp_dir):
-    magic = pytest.importorskip("magic")
-    orig_available = ExtensionFactory._magic_available
-    ExtensionFactory._magic_available = True
-    try:
-        path = tmp_dir / "test.csv"
-        path.write_text("a,b\n1,2")
+async def test_extension_factory_identify_tar(tmp_dir):
+    path = tmp_dir / "test.tar"
+    with tarfile.open(path, "w") as tf:
+        info = tarfile.TarInfo(name="file.txt")
+        data = b"hello"
+        info.size = len(data)
+        import io
 
-        def mock_from_file(*args, **kwargs):
-            raise magic.MagicException("Mock error")
+        tf.addfile(info, io.BytesIO(data))
+    result = await ExtensionFactory._identify(path)
+    assert result is Tar
 
-        monkeypatch.setattr(magic, "from_file", mock_from_file)
 
-        result = await ExtensionFactory._identify(path)
-        assert result is None
-        assert ExtensionFactory._magic_available
-    finally:
-        ExtensionFactory._magic_available = orig_available
+@pytest.mark.asyncio
+async def test_extension_factory_identify_pdf(tmp_dir):
+    path = tmp_dir / "test.pdf"
+    path.write_bytes(b"%PDF-1.4" + b"\x00" * 10)
+    result = await ExtensionFactory._identify(path)
+    assert result is PDF
+
+
+@pytest.mark.asyncio
+async def test_extension_factory_identify_json(tmp_dir):
+    path = tmp_dir / "test.json"
+    path.write_text('{"key": "value"}')
+    result = await ExtensionFactory._identify(path)
+    assert result is JSON
+
+
+@pytest.mark.asyncio
+async def test_extension_factory_identify_json_array(tmp_dir):
+    path = tmp_dir / "test.json"
+    path.write_text("[1, 2, 3]")
+    result = await ExtensionFactory._identify(path)
+    assert result is JSON
+
+
+@pytest.mark.asyncio
+async def test_extension_factory_identify_json_false_positive(tmp_dir):
+    path = tmp_dir / "test.bin"
+    path.write_text("{not valid json {{{")
+    result = await ExtensionFactory._identify(path)
+    assert result is None
+    cls = await ExtensionFactory.get_file_class(path)
+    assert cls is File
+
+
+@pytest.mark.asyncio
+async def test_extension_factory_identify_parquet(tmp_dir):
+    path = tmp_dir / "test.parquet"
+    import pyarrow as pa
+    import pyarrow.parquet as pq
+
+    table = pa.table({"a": [1, 2, 3]})
+    pq.write_table(table, path)
+    result = await ExtensionFactory._identify(path)
+    assert result is Parquet
+
+
+@pytest.mark.asyncio
+async def test_extension_factory_identify_unknown(tmp_dir):
+    path = tmp_dir / "test.bin"
+    path.write_bytes(b"\x00\x01\x02\x03")
+    result = await ExtensionFactory._identify(path)
+    assert result is None
+
+
+@pytest.mark.asyncio
+async def test_extension_factory_identify_dbf(tmp_dir):
+    pytest.importorskip("dbfread")
+    path = tmp_dir / "test.dbf"
+    _create_dbf(path, [("NAME", "C", 10, 0)], [("Alice",)])
+    result = await ExtensionFactory._identify(path)
+    assert result is DBF
+
+
+@pytest.mark.asyncio
+async def test_extension_factory_identify_wrong_extension(tmp_dir):
+    """Parquet content with .txt extension is detected by content."""
+    path = tmp_dir / "data.txt"
+    import pyarrow as pa
+    import pyarrow.parquet as pq
+
+    table = pa.table({"a": [1, 2, 3]})
+    pq.write_table(table, path)
+    result = await ExtensionFactory._identify(path)
+    assert result is Parquet
+    cls = await ExtensionFactory.get_file_class(path)
+    assert cls is Parquet
 
 
 # ---------------------------------------------------------------------------
@@ -1363,3 +1432,201 @@ async def test_dbf_to_parquet_fast_empty(tmp_dir):
     result = await obj.to_parquet(output_path=out, fast=True)
     assert isinstance(result, Parquet)
     assert out.exists()
+
+
+# ---------------------------------------------------------------------------
+# Regression tests for bugs found during review
+# ---------------------------------------------------------------------------
+
+
+def test_json_columns_reads_keys_correctly(tmp_dir):
+    """JSON.columns must parse first record's keys, not use nrows=0."""
+    path = tmp_dir / "data.json"
+    path.write_text(
+        '[{"name": "Alice", "age": 30}, {"name": "Bob", "age": 25}]'
+    )
+    obj = JSON(path=path)
+    cols = obj.columns
+    assert len(cols) == 2
+    names = {c.name for c in cols}
+    assert names == {"name", "age"}
+
+
+def test_json_columns_dict_object(tmp_dir):
+    """JSON.columns must handle top-level dict objects."""
+    path = tmp_dir / "data.json"
+    path.write_text('{"name": "Alice", "age": 30}')
+    obj = JSON(path=path)
+    cols = obj.columns
+    assert len(cols) == 2
+    names = {c.name for c in cols}
+    assert names == {"name", "age"}
+
+
+def test_json_columns_nested_list(tmp_dir):
+    """JSON.columns must return empty for nested structures with no keys."""
+    path = tmp_dir / "data.json"
+    path.write_text("[1, 2, 3]")
+    obj = JSON(path=path)
+    cols = obj.columns
+    assert cols == []
+
+
+@pytest.mark.asyncio
+async def test_tar_path_traversal_blocked(tmp_dir):
+    """Tar.extract() must reject members with path traversal."""
+    path = tmp_dir / "evil.tar"
+    with tarfile.open(path, "w") as t:
+        info = tarfile.TarInfo(name="../../etc/passwd")
+        data = b"evil"
+        info.size = len(data)
+        import io
+
+        t.addfile(info, io.BytesIO(data))
+    obj = Tar(path=path)
+    with pytest.raises(ValueError, match="Path traversal"):
+        await obj.extract(target_dir=tmp_dir / "out")
+
+
+@pytest.mark.asyncio
+async def test_zip_path_traversal_blocked(tmp_dir):
+    """Zip.extract() must reject members with path traversal."""
+    path = tmp_dir / "evil.zip"
+    with zipfile.ZipFile(path, "w") as z:
+        z.writestr("../../etc/passwd", "evil")
+    obj = Zip(path=path)
+    with pytest.raises(ValueError, match="Path traversal"):
+        await obj.extract(target_dir=tmp_dir / "out")
+
+
+@pytest.mark.asyncio
+async def test_csv_columns_semicolon_delimiter(tmp_dir):
+    """CSV.columns must use detected delimiter, not hardcode comma."""
+    path = tmp_dir / "data.csv"
+    path.write_text("name;age\nAlice;30\n")
+    obj = CSV(path=path)
+    await obj._get_sep()
+    cols = obj.columns
+    assert len(cols) == 2
+    names = {c.name for c in cols}
+    assert names == {"name", "age"}
+
+
+def test_csv_rows_quoted_newlines(tmp_dir):
+    """CSV.rows must not count newlines inside quoted fields."""
+    path = tmp_dir / "data.csv"
+    path.write_text('name,bio\nAlice,"line1\nline2"\nBob,x\n')
+    obj = CSV(path=path)
+    assert obj.rows == 2
+
+
+@pytest.mark.asyncio
+async def test_tar_type_is_tar(tmp_dir):
+    """Tar.type must be 'TAR', not 'ZIP'."""
+    path = tmp_dir / "test.tar"
+    with tarfile.open(path, "w") as t:
+        info = tarfile.TarInfo(name="file.txt")
+        data = b"hello"
+        info.size = len(data)
+        import io
+
+        t.addfile(info, io.BytesIO(data))
+    obj = Tar(path=path)
+    assert obj.type == "TAR"
+
+
+@pytest.mark.asyncio
+async def test_gzip_type_is_gzip(tmp_dir):
+    """GZip.type must be 'GZIP', not 'ZIP'."""
+    path = tmp_dir / "test.gz"
+    with gzip.open(path, "wb") as f:
+        f.write(b"hello")
+    obj = GZip(path=path)
+    assert obj.type == "GZIP"
+
+
+@pytest.mark.asyncio
+async def test_safe_cleanup_nested_directories(tmp_dir):
+    """Zip._safe_cleanup must handle nested directory structures."""
+    nested = tmp_dir / "a" / "b" / "c"
+    nested.mkdir(parents=True)
+    (nested / "file.txt").write_text("data")
+    (tmp_dir / "a" / "file2.txt").write_text("data2")
+
+    zip_path = tmp_dir / "test.zip"
+    with zipfile.ZipFile(zip_path, "w") as z:
+        z.writestr("a/b/c/file.txt", "data")
+        z.writestr("a/file2.txt", "data2")
+
+    obj = Zip(path=zip_path)
+    result = await obj.extract(target_dir=tmp_dir / "out")
+    assert len(result) > 0
+
+    await obj._safe_cleanup(tmp_dir / "out")
+    assert not (tmp_dir / "out").exists()
+
+
+@pytest.mark.asyncio
+async def test_tar_symlink_blocked(tmp_dir):
+    """Tar.extract() must reject symlinks."""
+    path = tmp_dir / "evil.tar"
+    with tarfile.open(path, "w") as t:
+        link = tarfile.TarInfo(name="link")
+        link.type = tarfile.SYMTYPE
+        link.linkname = "/etc/passwd"
+        t.addfile(link)
+    obj = Tar(path=path)
+    with pytest.raises(ValueError, match="Symlink"):
+        await obj.extract(target_dir=tmp_dir / "out")
+
+
+@pytest.mark.asyncio
+async def test_json_detect_valid(tmp_dir):
+    """JSON detection must succeed for valid small JSON."""
+    path = tmp_dir / "data.json"
+    path.write_text('{"a": 1, "b": 2}')
+    result = await ExtensionFactory._identify(path)
+    assert result is JSON
+
+
+@pytest.mark.asyncio
+async def test_json_detect_rejects_binary_starting_with_brace(tmp_dir):
+    """JSON detection must reject binary files starting with {."""
+    path = tmp_dir / "data.bin"
+    path.write_bytes(b"{\x00\x01\x02\x03}")
+    result = await ExtensionFactory._identify(path)
+    assert result is None
+
+
+@pytest.mark.asyncio
+async def test_parquet_columns_cached(tmp_dir):
+    """Parquet.columns must return the same list on repeated access."""
+    path = tmp_dir / "test.parquet"
+    table = pa.table({"x": [1, 2], "y": ["a", "b"]})
+    pq.write_table(table, path)
+    obj = Parquet(path=path)
+    first = obj.columns
+    second = obj.columns
+    assert first is second
+
+
+@pytest.mark.asyncio
+async def test_csv_columns_cached(tmp_dir):
+    """CSV.columns must return the same list on repeated access."""
+    path = tmp_dir / "test.csv"
+    path.write_text("a,b\n1,2\n")
+    obj = CSV(path=path)
+    first = obj.columns
+    second = obj.columns
+    assert first is second
+
+
+@pytest.mark.asyncio
+async def test_csv_rows_cached(tmp_dir):
+    """CSV.rows must return the same int on repeated access."""
+    path = tmp_dir / "test.csv"
+    path.write_text("a,b\n1,2\n3,4\n")
+    obj = CSV(path=path)
+    first = obj.rows
+    second = obj.rows
+    assert first == second