Describe the bug
POST to /api/database will overwrite an existing database instead of erroring

To Reproduce
Create a database with a POST to /api/database.
Run the same call again.

Expected behavior
Expect Metabase to error and say, "Database with name 'foo' already exists"

Actual behavior
Metabase gives another 200 and will overwrite any previous database config with

Most important: add link to Atlassian's documentation on how to generate an API token:
https://confluence.atlassian.com/cloud/api-tokens-938839638.html

It'd be useful to have an annotation like BoxAnnotation that creates a dividing line, but which can be angled. It's possible to achieve something similar with an image, but then interaction is extremely slow as the plot has to re-render the image at every frame.

Using [bands](https://bokeh.pydata.org/en/

I'm trying to set a customdata attribute to the nodes of a sankey diagram (i.e. percentage of node value of total value) and display that calculation when hovering over the node. I can't access the parent data customdata attribute in the node hovertemplate.

Could there be documentation for the event data available for node hovertemplates? Also, it'd be helpful to access the x0, x1, y0, y1 of t

• I have searched the issues of this repository and believe that this is not a duplicate.

What problem does this feature solve?

根据v3更新文档 https://www.yuque.com/antv/g2-docs/tutorial-g2-v3-changes ，等高线的旧 API chart.contour() 已经废弃并被 chart.polygon() 替代了，但是新版本的 Demo 中并没有给出相关的例子

What does the proposed API look like?

在 Demo 中给出等高线相关的例子

cc. @maartenbreddels

We are working on a Python -> Vega-expression transpilation package: https://github.com/QuantStack/py2vega

We provide mocking Python functions for all vega functions. In order to easily keep them up to date with vega it would be super useful to have spec files (JSON files?) for those functio

We don't seem to mention anywhere that .group() takes three parameters like .stack(), for any stacked charts.

• document stack.group(...)
• add a note to baseMixin.group()
• check if the second parameter to baseMixin.group() is used by anything not stacked

For anyone who'd like to contribute and don't know where to start - it might be a good idea to add more unit tests for any uncovered part

If you'd like contribute, please leave a comment here, specifying the areas (functions/files/packages), which you are going to cover

When looking at documentation there is dontCheckIfEmpty (optional) parameter description in XYPlot section. Presented example of empty chart has link to source file. This link is giving 404.
Invalid link https://github.com/uber/react-vis/blob/master/showcase/plot/empty-chart.js
![obraz](https://user-images.githubusercontent.com/22256011/50480536-c2f80500-09dc-11e9-8d0a-471cb1f29660.pn

Need a new article to describe and advertise new export single map feature

Here https://github.com/plotly/plotly.py/blob/master/packages/python/plotly/plotly/express/_doc.py#L164

We accept color scale names also right?

useGradientAlpha config property is currently not documented on the heatmap.js homepage

Priority

Low

Issue Description

In the screenshot below, LAST MODIFIED shows Sat, 26 Oct 1985 08:15:00 GMT,which is incorrect.

Expected Results

LAST MODIFIED shows correct timestamp, so that users know when this file is modified.

Screenshots/Related files

![image](https://user-images.githubusercontent.com/25629006/52917615-75906980-32a2-11e9-8825-10885a5955d2

Right now it shows up in access logs as "Go-http-client/1.1", which is very dull.

We could copy Prometheus, which sets it to something like "Prometheus/2.12.0".