basic file sharing

backend/migrations/20250810215614_create_shares_table.sql

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+CREATE TABLE shares (
+	id UUID PRIMARY KEY DEFAULT GEN_RANDOM_UUID(),
+	creator_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
+	warren_id UUID NOT NULL REFERENCES warrens(id) ON DELETE CASCADE,
+	path VARCHAR NOT NULL,
+	password_hash VARCHAR NOT NULL,
+	expires_at TIMESTAMP,
+	created_at TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP
+);