| context | Package context defines the Context type, which carries deadlines, cancellation signals, and other request-scoped values across API boundaries and between processes. |
| database/sql | Package sql provides a generic interface around SQL (or SQL-like) databases. |
| errors | Package errors implements functions to manipulate errors. |
| fmt | Package fmt implements formatted I/O with functions analogous to C's printf and scanf. |
| github.com/lib/pq | Package pq is a pure Go Postgres driver for the database/sql package. |
| sync | Package sync provides basic synchronization primitives such as mutual exclusion locks. |