feat: implement brand asset cleanup event handling and reconciliation logic

server/migrations/20260620110000_create_brand_asset_cleanup_events.down.sql

@@ -0,0 +1,4 @@
+DROP INDEX IF EXISTS idx_brands_deleting_cleanup_candidate;
+DROP INDEX IF EXISTS idx_brand_asset_cleanup_events_processing;
+
+DROP TABLE IF EXISTS brand_asset_cleanup_events;

server/migrations/20260620110000_create_brand_asset_cleanup_events.up.sql

@@ -0,0 +1,36 @@
+CREATE TABLE IF NOT EXISTS brand_asset_cleanup_events (
+    id                    BIGSERIAL PRIMARY KEY,
+    tenant_id             BIGINT NOT NULL,
+    brand_id              BIGINT NOT NULL,
+    status                VARCHAR(20) NOT NULL DEFAULT 'pending',
+    attempts              INT NOT NULL DEFAULT 0,
+    next_attempt_at       TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    last_error            TEXT,
+    locked_at             TIMESTAMPTZ,
+    locked_by             TEXT,
+    processed_at          TIMESTAMPTZ,
+    created_at            TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    updated_at            TIMESTAMPTZ NOT NULL DEFAULT NOW(),
+    CHECK (status IN ('pending', 'processing', 'success', 'failed'))
+);
+
+CREATE UNIQUE INDEX IF NOT EXISTS uk_brand_asset_cleanup_events_active
+    ON brand_asset_cleanup_events (tenant_id, brand_id)
+    WHERE status IN ('pending', 'processing', 'failed');
+
+CREATE INDEX IF NOT EXISTS idx_brand_asset_cleanup_events_pending
+    ON brand_asset_cleanup_events (next_attempt_at, id)
+    INCLUDE (tenant_id, brand_id)
+    WHERE status IN ('pending', 'failed');
+
+CREATE INDEX IF NOT EXISTS idx_brand_asset_cleanup_events_processing
+    ON brand_asset_cleanup_events (locked_at, id)
+    INCLUDE (tenant_id, brand_id)
+    WHERE status = 'processing'
+      AND locked_at IS NOT NULL;
+
+CREATE INDEX IF NOT EXISTS idx_brands_deleting_cleanup_candidate
+    ON brands (deleted_at, id)
+    INCLUDE (tenant_id)
+    WHERE status = 'deleting'
+      AND deleted_at IS NOT NULL;