diff --git a/deploy/postgres/goose/00043_2026-09-15-projection-outcome.sql b/deploy/postgres/goose/00043_2026-09-15-projection-outcome.sql
new file mode 100644
index 00000000..fc6bdb42
--- /dev/null
+++ b/deploy/postgres/goose/00043_2026-09-15-projection-outcome.sql
@@ -0,0 +1,17 @@
+-- +goose Up
+-- E1C: unique projection apply per envelope; no-replace is enforced in SQL + consumer.
+CREATE TABLE IF NOT EXISTS event_projection_outcomes (
+    source_event_id TEXT PRIMARY KEY,
+    doc_id TEXT NOT NULL,
+    version_no INT NOT NULL,
+    snapshot_id BIGINT NOT NULL DEFAULT 0,
+    applied BOOLEAN NOT NULL DEFAULT FALSE,
+    created_at TIMESTAMPTZ NOT NULL DEFAULT now()
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS uq_projection_doc_version
+    ON event_projection_outcomes (doc_id, version_no);
+
+-- +goose Down
+DROP INDEX IF EXISTS uq_projection_doc_version;
+DROP TABLE IF EXISTS event_projection_outcomes;