maxPoolSize configured

serverSelectionTimeoutMS set

socketTimeoutMS set

URI from environment variable

error event handler

disconnected event handler

SIGTERM handler

SIGINT handler

connection.close on shutdown

await on connect

startSession called

withTransaction used

session passed to debit

session passed to credit

endSession in finally

no independent updates

timestamps on Wallet schema

required on wallet fields

balanceCents minimum

runValidators on updates

author data embedded

no populate for author

tags as references

cursor-based pagination

no skip usage

limit plus one fetch

nextCursor returned

lean on feed query

timestamps on Post

status enum on Post

lean on listProducts

no lean on updateProductPrice

runValidators on admin update

save() for price update

no direct update for price

pre-save hook defined

enum for status

required fields

timestamps option

stock minimum constraint

new: true on admin update

timestamps on Event

timestamps on Ticket

timestamps on Session

required fields on Event

required fields on Ticket

enum for ticket status

enum for event category

trim on string fields

compound index on Event

unique index for email

TTL index on Session

TTL value for 7 days