retention_policy_size: minor cleanup of comments and imports

waku/waku_archive/retention_policy/retention_policy_size.nim

@@ -4,11 +4,9 @@ else:
   {.push raises: [].}
 
 import
-  std/times,
   stew/results,
   chronicles,
-  chronos,
-  os
+  chronos
 import
   ../driver,
   ../retention_policy
@@ -19,18 +17,9 @@ logScope:
 # default size is 30 GiB or 32212254720.0 in bytes
 const DefaultRetentionSize*: int64 = 32212254720
 
-
-
 type
-  # SizeRetentionPolicy implements auto delete as follows:
-  # - sizeLimit is the size in bytes the database can grow upto
-  # to reduce the size of the databases, remove the rows/number-of-messages
-  # DeleteLimit is the total number of messages to delete beyond this limit
-  # when the database size crosses the sizeLimit, then only a fraction of messages are kept,
-  # rest of the outdated message are deleted using deleteOldestMessagesNotWithinLimit(),
-  # upon deletion process the fragmented space is retrieve back using Vacuum process. 
   SizeRetentionPolicy* = ref object of RetentionPolicy
-      sizeLimit: int64
+    sizeLimit: int64
 
 proc new*(T: type SizeRetentionPolicy, size=DefaultRetentionSize): T =
   SizeRetentionPolicy(