Don't make weird id ints.

I thought I could generate names from these but it's just more cruft.

stars.py

@@ -35,7 +35,7 @@ Stars have what qualities?
  ♈ ♉ ♊ ♋ ♌ ♍ ♎ ♏ ♐ ♑ ♒ ♓
 
 '''
-from random import randint, expovariate, seed, getrandbits, gauss
+from random import randint, expovariate, seed, gauss
 from poisson import poisson
 
 
@@ -50,28 +50,8 @@ WIDTH, HEIGHT = 10240, 7680
 
 # Database stuff.  SQL, etc.
 
-def generate_list_of_u64_for_ids(n):
-    '''
-    Return a sorted list of n random 64-bit integers
-    (suitable for SQLite rowid columns.)
-    See https://www.sqlite.org/lang_createtable.html#rowid
-    '''
-    result = set()
-    safety = 10
-    while n > 0:
-        canidate = getrandbits(63)
-        while canidate in result:
-            if not safety:
-                raise RuntimeError('this should not happen')
-            safety -= 1
-            canidate = getrandbits(63)
-        result.add(canidate)
-        n -= 1
-    return sorted(result)
-
-
 TABLES = [
-    'create table stars (id INTEGER PRIMARY KEY, x INTEGER, y INTEGER, radius INTEGER)',
+    'create table stars (id INTEGER PRIMARY KEY AUTOINCREMENT, x INTEGER, y INTEGER, radius INTEGER)',
     ('''\
     create table planets (
         id INTEGER PRIMARY KEY,
@@ -88,9 +68,8 @@ def init_db(conn):
     print('Generating star data.')
     c = conn.cursor()
     for values in generate_stars(WIDTH, HEIGHT, MINIMUM_DISTANCE_BETWEEN_STARS):
-        c.execute('insert into stars values (?, ?, ?, ?)', values)
-        star_id = values[0]
-        generate_planets_for_star(c, star_id)
+        c.execute('insert into stars(x, y, radius) values (?, ?, ?)', values)
+        generate_planets_for_star(c)
     c.close()
     conn.commit()
 
@@ -106,12 +85,8 @@ def iter_stars(conn):
 
 
 def generate_stars(width, height, minimum_distance_between_stars):
-    # we could just call getrandbits(64) here for ID and hope for the best.
-    # it's a large domain (u64) so collisions are unlikely(!).
-    coords = list(poisson(width, height, minimum_distance_between_stars))
-    ids = generate_list_of_u64_for_ids(len(coords))
-    for star_id, (x, y) in zip(ids, coords):
-        yield star_id, x, y, round(1 + expovariate(1))
+    for (x, y) in poisson(width, height, minimum_distance_between_stars):
+        yield x, y, round(1 + expovariate(1))
 
 
 def how_many_planets():
@@ -120,7 +95,8 @@ def how_many_planets():
         n = round(gauss(5, 5))
     return n
 
-def generate_planets_for_star(c, star_id):
+def generate_planets_for_star(c):
+    star_id = c.lastrowid
     for ordo in range(1, how_many_planets() + 1):
         c.execute('insert into planets(ordo, star) values (?, ?)', (ordo, star_id))