initial code

.env.example

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+# PostgreSQL connection values. Copy names only; never commit real credentials.
+PGHOST=
+PGPORT=5432
+PGDATABASE=countydata
+PGUSER=
+PGPASSWORD=
+PGSSLMODE=require
+
+# Project-specific HMAC secret for replacing VINs in private analytical data.
+# Encode exactly 32 random bytes as 64 hexadecimal characters. Alternatively,
+# leave VIN_HASH_KEY empty and store the hex key in .secrets/vin_hmac.key (0600).
+VIN_HASH_KEY=
+VIN_HASH_KEY_FILE=.secrets/vin_hmac.key
+VIN_HASH_KEY_VERSION=v1