Add PostgreSQL database with auto-created rsvps table

go.mod

@@ -2,7 +2,10 @@ module tickets
 
 go 1.25.4
 
-require google.golang.org/api v0.258.0
+require (
+	github.com/lib/pq v1.10.9
+	google.golang.org/api v0.258.0
+)
 
 require (
 	cloud.google.com/go/auth v0.17.0 // indirect

go.sum

@@ -25,6 +25,8 @@ github.com/googleapis/enterprise-certificate-proxy v0.3.7 h1:zrn2Ee/nWmHulBx5sAV
 github.com/googleapis/enterprise-certificate-proxy v0.3.7/go.mod h1:MkHOF77EYAE7qfSuSS9PU6g4Nt4e11cnsDUowfwewLA=
 github.com/googleapis/gax-go/v2 v2.15.0 h1:SyjDc1mGgZU5LncH8gimWo9lW1DtIfPibOG81vgd/bo=
 github.com/googleapis/gax-go/v2 v2.15.0/go.mod h1:zVVkkxAQHa1RQpg9z2AUCMnKhi0Qld9rcmyfL1OZhoc=
+github.com/lib/pq v1.10.9 h1:YXG7RB+JIjhP29X+OtkiDnYaXQwpS4JEWq7dtCCRUEw=
+github.com/lib/pq v1.10.9/go.mod h1:AlVN5x4E4T544tWzH6hKfbfQvm3HdbOxrmggDNAPY9o=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=

main.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"context"
+	"database/sql"
 	"encoding/base64"
 	"encoding/json"
 	"html/template"
@@ -11,13 +12,40 @@ import (
 	"path/filepath"
 	"strings"
 
+	_ "github.com/lib/pq"
 	"google.golang.org/api/idtoken"
 )
 
-var templates *template.Template
+var (
+	templates *template.Template
+	db        *sql.DB
+)
 
 func init() {
 	templates = template.Must(template.ParseGlob("static/*.html"))
+
+	var err error
+	db, err = sql.Open("postgres", os.Getenv("PGCONN"))
+	if err != nil {
+		log.Fatal("[ERROR] failed to open database: ", err)
+	}
+
+	if err = db.Ping(); err != nil {
+		log.Fatal("[ERROR] failed to connect to database: ", err)
+	}
+
+	_, err = db.Exec(`
+		CREATE TABLE IF NOT EXISTS rsvps (
+			event_id TEXT NOT NULL,
+			google_username TEXT NOT NULL,
+			num_people INTEGER NOT NULL DEFAULT 0,
+			donation DECIMAL(10,2) NOT NULL DEFAULT 0,
+			PRIMARY KEY (event_id, google_username)
+		)
+	`)
+	if err != nil {
+		log.Fatal("[ERROR] failed to create table: ", err)
+	}
 }
 
 func main() {