Duplicate unique indexes on PostgreSQL

Generated by doctrine-cli SQL is:

– this is ok
CREATE TABLE "image" ("id" BIGSERIAL, "alt" VARCHAR(255), "title" VARCHAR(500), "filename" VARCHAR(255), "width" BIGINT, "height" BIGINT, "slug" VARCHAR(255), "createdat" TIMESTAMP NOT NULL, "updatedat" TIMESTAMP NOT NULL, PRIMARY KEY("id"));
CREATE TABLE "news" ("id" BIGSERIAL, "title" VARCHAR(255), "leadmarkup" VARCHAR(500), "leadhtml" VARCHAR(600), "bodymarkup" TEXT, "bodyhtml" TEXT, "slug" VARCHAR(255), "createdat" TIMESTAMP NOT NULL, "updatedat" TIMESTAMP NOT NULL, PRIMARY KEY("id"));
CREATE TABLE "snippet" ("id" BIGSERIAL, "name" VARCHAR(255), "bodymarkup" TEXT, "bodyhtml" TEXT, "slug" VARCHAR(255), "createdat" TIMESTAMP NOT NULL, "updatedat" TIMESTAMP NOT NULL, PRIMARY KEY("id"));
– this causes error
CREATE UNIQUE INDEX "sluggable" ON "image" ("slug");
CREATE UNIQUE INDEX "sluggable" ON "news" ("slug");
CREATE UNIQUE INDEX "sluggable" ON "snippet" ("slug");

After importing this to PostgreSQL, I get 'index already exists' error.

On PostgreSQL unique indexes names must not be the same.
I think the correct form should be:
CREATE UNIQUE INDEX "sluggable-image" ON "image" ("slug");
CREATE UNIQUE INDEX "sluggable-news" ON "news" ("slug");
CREATE UNIQUE INDEX "sluggable-snippet" ON "snippet" ("slug");

Schema file attached.