Add push server component template

pushserver/storage/postgres/storage.go

@@ -0,0 +1,31 @@
+package postgres
+
+import (
+	"fmt"
+
+	"github.com/matrix-org/dendrite/internal/sqlutil"
+	"github.com/matrix-org/dendrite/pushserver/storage/shared"
+	"github.com/matrix-org/dendrite/setup/config"
+)
+
+type Database struct {
+	shared.Database
+	sqlutil.PartitionOffsetStatements
+}
+
+func Open(dbProperties *config.DatabaseOptions) (*Database, error) {
+	var d Database
+	var err error
+	if d.DB, err = sqlutil.Open(dbProperties); err != nil {
+		return nil, fmt.Errorf("sqlutil.Open: %w", err)
+	}
+	d.Writer = sqlutil.NewDummyWriter()
+
+	if err = d.PartitionOffsetStatements.Prepare(d.DB, d.Writer, "pushserver"); err != nil {
+		return nil, err
+	}
+
+	// Create the tables.
+
+	return &d, nil
+}