Remove id indices from models
Remove id indices from models

These indices will be created automatically by both SQLite3 and
PostgreSQL as they are primary keys.

References:

> PostgreSQL automatically creates an index for each unique constraint
> and primary key constraint to enforce uniqueness.

http://www.postgresql.org/docs/current/interactive/sql-createtable.html#SQL-CREATETABLE-NOTES

> In most cases, UNIQUE and PRIMARY KEY constraints are implemented by
> creating a unique index in the database.

http://www.sqlite.org/lang_createtable.html#constraints

mattbostock/leavediary