Change DROP INDEX statements to DROP INDEX IF EXISTS, meaning the
upgrade does not fail if they do not already exist (which is the desired
end state anyway).
Bug: T336868
Change-Id: Id073beda84065b067994a7405a78d484346b550d
Also, fixing two data type drifts in Postgres:
- lc_key was varchar (with no binary flag) in MySQL but TEXT in
Postgres while PG supports varchar. Changing PG to varchar.
- lc_value was BYTEA but the rest of varbinary fields are mapped to
TEXT, changing it to TEXT data type.
And fixing primary key of these tables in Postgres too as it was a unique index instead.
Bug: T198811
Bug: T164898
Bug: T230428
Change-Id: I50305556bd870461d05f98c5272cf1d6a65deb15
