Correctly define unique constraint in SQLite table definition #16

Job	Run time
Build extension binaries / Generate matrix	38s
Build extension binaries / DuckDB-Wasm	0s
Build extension binaries / MacOS (osx_amd64, x86_64, x64-osx)	4m 17s
Build extension binaries / Windows (windows_amd64, x64-windows-static-md)	18m 26s
Build extension binaries / Linux (linux_amd64, ubuntu:18.04, x64-linux)	15m 59s
Build extension binaries / MacOS (osx_arm64, arm64, arm64-osx)	3m 55s
Build extension binaries / Windows (windows_amd64_rtools, x64-mingw-static)	40m 10s
Build extension binaries / Linux (linux_amd64_gcc4, quay.io/pypa/manylinux2014_x86_64, x64-linux)	2m 34s
Build extension binaries / Linux (linux_arm64, ubuntu:18.04, arm64-linux)	18m 30s
Deploy extension binaries / Generate matrix	19s
Deploy extension binaries / Deploy (linux_amd64)	32s
Deploy extension binaries / Deploy (linux_amd64_gcc4)	28s
Deploy extension binaries / Deploy (linux_arm64)	28s
Deploy extension binaries / Deploy (osx_amd64)	27s
Deploy extension binaries / Deploy (osx_arm64)	27s
Deploy extension binaries / Deploy (windows_amd64)	27s
Deploy extension binaries / Deploy (windows_amd64_rtools)	33s
	1h 48m 10s

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