Add mailer system

Signed-off-by: gearnode <bryan@frimin.fr>

pkg/coredata/migrations/20250311T183100Z.sql

@@ -0,0 +1,11 @@
+CREATE TABLE emails (
+	id TEXT PRIMARY KEY,
+	email_address_to TEXT NOT NULL,
+	subject TEXT NOT NULL,
+	text_body TEXT NOT NULL,
+	created_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+	updated_at TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_TIMESTAMP,
+	sent_at TIMESTAMP WITH TIME ZONE
+);
+
+CREATE INDEX ON emails (sent_at) WHERE sent_at IS NULL;