How do I ALTER a PostgreSQL table and make a column unique?

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I have a table in PostgreSQL where the schema looks like this:

CREATE TABLE "foo_table" (
    "id" serial NOT NULL PRIMARY KEY,
    "permalink" varchar(200) NOT NULL,
    "text" varchar(512) NOT NULL,
    "timestamp" timestamp with time zone NOT NULL
)

Now I want to make the permalink unique across the table by ALTER-ing the table.

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