[chore/performance] use only 1 sqlite db connection regardless of mul…

…tiplier (#1408)

docs/configuration/database.md

@@ -128,6 +128,10 @@ db-tls-ca-cert: ""
 #
 # If you set the multiplier to less than 1, only one open connection will be used regardless of cpu count.
 #
+# PLEASE NOTE!!: This setting currently only applies for Postgres. SQLite will always use 1 connection regardless
+# of what is set here. This behavior will change in future when we implement better SQLITE_BUSY handling.
+# See https://github.com/superseriousbusiness/gotosocial/issues/1407 for more details.
+#
 # Examples: [16, 8, 10, 2]
 # Default: 8
 db-max-open-conns-multiplier: 8

example/config.yaml

@@ -184,6 +184,10 @@ db-tls-ca-cert: ""
 #
 # If you set the multiplier to less than 1, only one open connection will be used regardless of cpu count.
 #
+# PLEASE NOTE!!: This setting currently only applies for Postgres. SQLite will always use 1 connection regardless
+# of what is set here. This behavior will change in future when we implement better SQLITE_BUSY handling.
+# See https://github.com/superseriousbusiness/gotosocial/issues/1407 for more details.
+#
 # Examples: [16, 8, 10, 2]
 # Default: 8
 db-max-open-conns-multiplier: 8

internal/db/bundb/bundb.go

@@ -304,9 +304,9 @@ func sqliteConn(ctx context.Context) (*DBConn, error) {
 	// Tune db connections for sqlite, see:
 	// - https://bun.uptrace.dev/guide/running-bun-in-production.html#database-sql
 	// - https://www.alexedwards.net/blog/configuring-sqldb
-	sqldb.SetMaxOpenConns(maxOpenConns()) // x number of conns per cpu
-	sqldb.SetMaxIdleConns(1)              // only keep max 1 idle connection around
-	sqldb.SetConnMaxLifetime(0)           // don't kill connections due to age
+	sqldb.SetMaxOpenConns(1)    // only 1 connection regardless of multiplier, see https://github.com/superseriousbusiness/gotosocial/issues/1407
+	sqldb.SetMaxIdleConns(1)    // only keep max 1 idle connection around
+	sqldb.SetConnMaxLifetime(0) // don't kill connections due to age
 
 	// Wrap Bun database conn in our own wrapper
 	conn := WrapDBConn(bun.NewDB(sqldb, sqlitedialect.New()))