Datenbank von SQLite auf Postgres umgestellt

Verbindung über KVER_DSN; Tabelle user heißt jetzt account (reserviertes
Wort in Postgres). kver import-sqlite übernimmt die alte Datei einmalig in
einer Transaktion.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TiXsPUqw7oeomZ8wZrQW5q

go.mod

@@ -5,22 +5,28 @@ go 1.25.0
 require (
 	github.com/go-chi/chi/v5 v5.3.0
 	github.com/go-chi/httprate v0.15.0
+	github.com/jackc/pgx/v5 v5.11.0
 	github.com/oschwald/maxminddb-golang v1.13.1
 	golang.org/x/crypto v0.52.0
 	golang.org/x/image v0.41.0
-	modernc.org/sqlite v1.51.0
+	modernc.org/sqlite v1.59.0
 )
 
 require (
 	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/google/uuid v1.6.0 // indirect
+	github.com/jackc/pgpassfile v1.0.0 // indirect
+	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
+	github.com/jackc/puddle/v2 v2.2.2 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.10 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/mattn/go-isatty v0.0.24 // indirect
 	github.com/ncruces/go-strftime v1.0.0 // indirect
 	github.com/remyoudompheng/bigfft v0.0.0-20230129092748-24d4a6f8daec // indirect
 	github.com/zeebo/xxh3 v1.0.2 // indirect
-	golang.org/x/sys v0.45.0 // indirect
-	modernc.org/libc v1.72.3 // indirect
+	golang.org/x/sync v0.22.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
+	golang.org/x/text v0.37.0 // indirect
+	modernc.org/libc v1.75.7 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
-	modernc.org/memory v1.11.0 // indirect
+	modernc.org/memory v1.12.1 // indirect
 )