thank you for your inquiry. To get district-level data simply replace drug_reg with drug_distr: https://enforce.carto.com/api/v2/sql?q=SELECT name, nameeng, oktmo, osm_id, region, regioneng, cn_amph, cn_anab, cn_cann, cn_coca, cn_deso, cn_ecst, cn_hero, cn_opio, cn_othe, cn_popp, cn_scan, cn_sibu, drcrs, kndrcrs, meddrv, valp10, valp20, valp30, valp40, valp50, valp50, valp60, valp70, valp80, valp90 FROM drug_distr
mvdvp10 et al. are from percentile chart on the second tab of the infowindow.
On .prj — again, I can only suggest you familiarise yourself with shapefiles more. This file is related to your geometry, not the .dbf. So, I am afraid it is pointless to provide this file for you as it merely describes the chosen geometry.
First, I could suggest reading up a bit on shapefile data structure. Apart from the .shp (geometry file) it contains information on projection (.prj) and the data (.dbf), inter alia. The API now returns the data contained in the DBF, not the geometry. For geometry you can use any Russian region admin1 shapefile (say, from GADM) and then merge the data you got from the API (represented as the new DBF) on appropriately prepared region field with your geometry. Any GIS software in capable of that.
On attribute disambiguation: since the API is undocumented I suggest you reverse-engineer it — open one region on the map and look for the same values in corresponding API return for this region. That will give you an idea on what variables stand for.
On variable types: it's easily fixable in any statistical package (say, in R: v <- as.integer(v)).
Thank you for your interest in our project. Please be advised that the (region-level) data can be furnished through an SQL-flavoured API in JSON (which is then easily convertible into CSV): https://enforce.carto.com/api/v2/sql?q=SELECT mvdcode, oktmo, region, regioneng, drcrsmvd, drcrsfns, drcrs, kndrcrs, mvdvp10, mvdvp20, mvdvp30, mvdvp40, mvdvp50, mvdvp60, mvdvp70, mvdvp80, mvdvp90, fnsvp10, fnsvp20, fnsvp30, fnsvp40, fnsvp50, fnsvp60, fnsvp70, fnsvp80, fnsvp90, cn_amph, cn_anab, cn_cann, cn_deso, cn_othe, cn_ecst, cn_hero, cn_coca, cn_popp, cn_opio, cn_sibu, cn_scan, region_pop, drshmvd, drshfns, drmoder, modmvdr, modmvde, modfnsr, modfnse, prctoverla FROM drug_reg
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