diff --git a/migrations/postgres/000016_prefix_snapshot.down.sql b/migrations/postgres/000016_prefix_snapshot.down.sql
new file mode 100644
index 0000000..3ec1edd
--- /dev/null
+++ b/migrations/postgres/000016_prefix_snapshot.down.sql
@@ -0,0 +1,3 @@
+ALTER TABLE config_revision DROP COLUMN IF EXISTS prefix_snapshot_id;
+DROP TABLE IF EXISTS prefix_snapshot_row;
+DROP TABLE IF EXISTS prefix_snapshot;
diff --git a/migrations/postgres/000016_prefix_snapshot.up.sql b/migrations/postgres/000016_prefix_snapshot.up.sql
new file mode 100644
index 0000000..3e0efce
--- /dev/null
+++ b/migrations/postgres/000016_prefix_snapshot.up.sql
@@ -0,0 +1,22 @@
+-- Content-addressed prefix snapshots (H2 expand).
+
+CREATE TABLE prefix_snapshot (
+    id            UUID PRIMARY KEY DEFAULT gen_random_uuid(),
+    content_hash  CHAR(64) NOT NULL,
+    created_at    TIMESTAMPTZ NOT NULL DEFAULT now(),
+    CONSTRAINT prefix_snapshot_hash_uniq UNIQUE (content_hash)
+);
+
+CREATE TABLE prefix_snapshot_row (
+    snapshot_id   UUID NOT NULL REFERENCES prefix_snapshot (id) ON DELETE CASCADE,
+    ord           INTEGER NOT NULL,
+    prefix        CIDR NOT NULL,
+    community_id  UUID REFERENCES bgp_community (id) ON DELETE SET NULL,
+    source        TEXT NOT NULL DEFAULT '',
+    PRIMARY KEY (snapshot_id, ord)
+);
+
+CREATE INDEX idx_prefix_snapshot_row_snapshot ON prefix_snapshot_row (snapshot_id);
+
+ALTER TABLE config_revision
+    ADD COLUMN prefix_snapshot_id UUID REFERENCES prefix_snapshot (id) ON DELETE RESTRICT;
diff --git a/migrations/sqlite/000016_prefix_snapshot.down.sql b/migrations/sqlite/000016_prefix_snapshot.down.sql
new file mode 100644
index 0000000..6bfe79c
--- /dev/null
+++ b/migrations/sqlite/000016_prefix_snapshot.down.sql
@@ -0,0 +1,3 @@
+ALTER TABLE config_revision DROP COLUMN prefix_snapshot_id;
+DROP TABLE IF EXISTS prefix_snapshot_row;
+DROP TABLE IF EXISTS prefix_snapshot;
diff --git a/migrations/sqlite/000016_prefix_snapshot.up.sql b/migrations/sqlite/000016_prefix_snapshot.up.sql
new file mode 100644
index 0000000..3969a45
--- /dev/null
+++ b/migrations/sqlite/000016_prefix_snapshot.up.sql
@@ -0,0 +1,18 @@
+CREATE TABLE prefix_snapshot (
+    id            TEXT NOT NULL PRIMARY KEY,
+    content_hash  TEXT NOT NULL UNIQUE,
+    created_at    TEXT NOT NULL DEFAULT (strftime('%Y-%m-%dT%H:%M:%fZ', 'now'))
+);
+
+CREATE TABLE prefix_snapshot_row (
+    snapshot_id   TEXT NOT NULL REFERENCES prefix_snapshot (id) ON DELETE CASCADE,
+    ord           INTEGER NOT NULL,
+    prefix        TEXT NOT NULL,
+    community_id  TEXT,
+    source        TEXT NOT NULL DEFAULT '',
+    PRIMARY KEY (snapshot_id, ord)
+);
+
+CREATE INDEX idx_prefix_snapshot_row_snapshot ON prefix_snapshot_row (snapshot_id);
+
+ALTER TABLE config_revision ADD COLUMN prefix_snapshot_id TEXT REFERENCES prefix_snapshot (id) ON DELETE RESTRICT;