/*

  Create a database at first:

    CREATE DATABASE sonews ENCODING 'UTF8';

*/

/* 

  flags:

  If bit 0 is set, groups is a mirrorred mailing list. 

  If not set default newsgroup.

  Normalization: 1NF, 2NF, 3NF

*/

CREATE TABLE groups 

(

  group_id      SERIAL,

  name          VARCHAR(80) NOT NULL,

  flags         SMALLINT DEFAULT 0,

  PRIMARY KEY(group_id),

  UNIQUE(name)

);

CREATE TABLE articles 

(

  article_id    INT,

  body          BYTEA,

  PRIMARY KEY(article_id)

);

CREATE TABLE article_ids

(

  article_id  INT REFERENCES articles(article_id) ON DELETE CASCADE,

  message_id  VARCHAR(255),

  PRIMARY KEY(article_id),

  UNIQUE(message_id)

);

CREATE TABLE headers

(

  article_id    INT REFERENCES articles(article_id) ON DELETE CASCADE,

  header_key    VARCHAR(255),

  header_value  TEXT,

  header_index  INT,

  PRIMARY KEY(article_id, header_key, header_index)

);

/*

  Normalization: 1NF, 2NF

*/

CREATE TABLE postings 

(

  group_id      INTEGER,

  article_id    INTEGER REFERENCES articles (article_id) ON DELETE CASCADE,

  article_index INTEGER NOT NULL, 

  PRIMARY KEY(group_id, article_id)

);

/* 

  Table for association of newsgroups and mailing-lists 

  Normalization: 1NF, 2NF, 3NF

*/

CREATE TABLE groups2list

(

  group_id   INTEGER REFERENCES groups(group_id) ON DELETE CASCADE,

  listaddress VARCHAR(255),

  PRIMARY KEY(group_id, listaddress),

  UNIQUE(listaddress)

);

/* 

  Configuration table, containing key/value pairs 

  Normalization: 1NF, 2NF, 3NF

*/

CREATE TABLE config

(

  config_key     VARCHAR(255),

  config_value   TEXT,

  PRIMARY KEY(config_key)

);

/* 

  Newsserver peers 

  Normalization: 1NF (atomic values), 2NF

*/

CREATE TABLE peers

(

  peer_id     SERIAL,

  host        VARCHAR(255),

  port        SMALLINT,

  PRIMARY KEY(peer_id),

  UNIQUE(host, port)

);

/* 

  List of newsgroups to feed into sonews 

  Normalization: 1NF, 2NF, 3NF

*/

CREATE TABLE peer_subscriptions

(

  peer_id    INTEGER REFERENCES peers (peer_id) ON DELETE CASCADE, 

  group_id   INTEGER REFERENCES groups (group_id) ON DELETE CASCADE,

  feedtype   SMALLINT DEFAULT 0, /* 0: pullfeed; 1: pushfeed */

  PRIMARY KEY(peer_id, group_id, feedtype)

);

/* 

   Tables for server event statistics

   Possible statistic keys:

   1=CONNECTIONS     (active connections)

   2=POSTED_NEWS     (directly to the server posted unique messages)

   3=GATEWAYED_NEWS  (posted unique message gateways through the ML-gateway)

   4=FEEDED_NEWS     (unique messages feed via NNTP)

   The server will create snapshots of the above data.

   Normalization: 1NF, 2NF

*/

CREATE TABLE events

(

  event_time         BIGINT,   /* time of this snapshot */

  event_key          SMALLINT,  /* which data */

  group_id           INT REFERENCES groups(group_id) ON DELETE CASCADE,

  PRIMARY KEY(event_time, event_key)

);