Centralize durable schema migration ownership

crates/remora-schema/migrations/api/0001_live_event_history.sql

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+CREATE TABLE live_event_history_state (
+    singleton BOOLEAN PRIMARY KEY DEFAULT TRUE CHECK (singleton),
+    floor_outbox_id BIGINT NOT NULL DEFAULT 0 CHECK (floor_outbox_id >= 0),
+    progress_poll_not_before TIMESTAMPTZ NOT NULL DEFAULT '-infinity'
+);
+
+INSERT INTO live_event_history_state (singleton) VALUES (TRUE);
+
+CREATE TABLE live_progress_event_state (
+    job_id TEXT PRIMARY KEY REFERENCES jobs (job_id),
+    attempt_id TEXT NOT NULL,
+    fence BIGINT NOT NULL CHECK (fence BETWEEN 1 AND 9007199254740991),
+    progress_present BOOLEAN NOT NULL,
+    completed_bytes BIGINT,
+    total_bytes BIGINT,
+    completed_members BIGINT,
+    total_members BIGINT,
+    updated_at TIMESTAMPTZ NOT NULL,
+    CONSTRAINT live_progress_event_shape_check CHECK (
+        (
+            progress_present
+            AND completed_bytes IS NOT NULL
+            AND completed_members IS NOT NULL
+        )
+        OR (
+            NOT progress_present
+            AND completed_bytes IS NULL
+            AND total_bytes IS NULL
+            AND completed_members IS NULL
+            AND total_members IS NULL
+        )
+    )
+);

crates/remora-schema/migrations/api/0002_live_event_tickets.sql

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+CREATE TABLE live_event_tickets (
+    ticket_digest BYTEA PRIMARY KEY CHECK (octet_length(ticket_digest) = 32),
+    principal JSONB NOT NULL,
+    origin TEXT NOT NULL CHECK (origin <> ''),
+    created_at TIMESTAMPTZ NOT NULL,
+    expires_at TIMESTAMPTZ NOT NULL CHECK (expires_at > created_at)
+);
+
+CREATE INDEX live_event_tickets_expiry_idx
+    ON live_event_tickets (expires_at);