Added new tables units and units_members

migrations/2020-12-05-203809_create_units/down.sql

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+-- This file should undo anything in `up.sql`
+drop table units;

migrations/2020-12-05-203809_create_units/up.sql

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+-- Your SQL goes here
+create table units
+(
+    unit_id uuid default uuid_generate_v1() not null
+        constraint untis_pk
+            primary key,
+    name text not null
+);

migrations/2020-12-05-203818_create_units_members/down.sql

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+-- This file should undo anything in `up.sql`
+drop table units_members;

migrations/2020-12-05-203818_create_units_members/up.sql

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+create table units_members
+(
+    unit_id uuid
+        constraint units_members_units_unit_id_fk
+            references units
+            on update cascade on delete cascade,
+    member_id uuid
+        constraint units_members_members_entity_id_fk
+            references members
+            on update cascade on delete cascade,
+    crew smallint not null,
+    PRIMARY KEY (unit_id, member_id)
+);
+