# Custom PostgreSQL 18.4 image with pg_partman + pg_cron extensions.
#
# The logs table of new-api is a RANGE-partitioned table on created_at, created
# and maintained entirely on the database side by the pg_partman extension.
# pg_cron drives periodic maintenance (premake future weekly partitions).
#
# Both extensions are installed via Debian packages. pg_cron must be loaded via
# shared_preload_libraries, so we append it to postgresql.conf.sample: initdb
# generates PGDATA/postgresql.conf from this sample, meaning both the temporary
# server (during docker-entrypoint-initdb.d) and the real server load pg_cron,
# allowing CREATE EXTENSION pg_cron to succeed at init time.
#
# Build/push:
#   docker build -t registry.cn-hangzhou.aliyuncs.com/fengsilin/postgres-partman:18 .
#   docker push registry.cn-hangzhou.aliyuncs.com/fengsilin/postgres-partman:18

FROM postgres:18

# Use Aliyun Debian mirror for faster/reliable apt downloads from within China.
# postgres:18 is based on Debian trixie which uses the deb822-format
# /etc/apt/sources.list.d/debian.sources file instead of sources.list.
RUN sed -i 's|deb.debian.org|mirrors.aliyun.com|g; s|security.debian.org|mirrors.aliyun.com|g' \
        /etc/apt/sources.list.d/debian.sources

RUN apt-get update \
    && apt-get install -y --no-install-recommends \
        postgresql-18-partman \
        postgresql-18-cron \
    && rm -rf /var/lib/apt/lists/*

# Preload pg_cron so it is available during first-run init scripts.
# pg_partman is a plain SQL extension and does not need preloading.
RUN echo "shared_preload_libraries = 'pg_cron'" >> /usr/share/postgresql/18/postgresql.conf.sample
RUN echo "cron.database_name = 'new-api'" >> /usr/share/postgresql/18/postgresql.conf.sample

# First-run init: create extensions, the partitioned logs parent table, register
# it with pg_partman, build core indexes, and schedule maintenance via pg_cron.
# Runs against the database named by POSTGRES_DB (new-api).
COPY docker-entrypoint-initdb.d/01-partition.sql /docker-entrypoint-initdb.d/01-partition.sql