Add midnight shot synthetic event.

It inserts `LDSP` and `FDSP` labels, if those exist
in the `labels` table, on the last and first shotpoints
of the day when a sequence is shot through midnight.

The server timezone is always set to UTC so the midnight
shot implicitly refers to UTC through this.

etc/db/schema-template.sql

@@ -172,6 +172,77 @@ NOTE: The proper way of doing this would be to define an EngineeringCRS in the s
 
 SET default_tablespace = '';
 
+--
+-- Name: labels; Type: TABLE; Schema: _SURVEY__TEMPLATE_; Owner: postgres
+--
+
+CREATE TABLE _SURVEY__TEMPLATE_.labels (
+    name text NOT NULL,
+    data jsonb NOT NULL
+);
+
+
+ALTER TABLE _SURVEY__TEMPLATE_.labels OWNER TO postgres;
+
+--
+-- Name: TABLE labels; Type: COMMENT; Schema: _SURVEY__TEMPLATE_; Owner: postgres
+--
+
+COMMENT ON TABLE _SURVEY__TEMPLATE_.labels IS 'Labels to attach to events, shots, or anything else really. Each level consists of a (unique) name and a JSON object with arbitrary label properties (intended to be used for label descriptions, colours, etc.)';
+
+
+--
+-- Name: raw_shots; Type: TABLE; Schema: _SURVEY__TEMPLATE_; Owner: postgres
+--
+
+CREATE TABLE _SURVEY__TEMPLATE_.raw_shots (
+    sequence integer NOT NULL,
+    line integer NOT NULL,
+    point integer NOT NULL,
+    objref integer NOT NULL,
+    tstamp timestamp with time zone NOT NULL,
+    hash text NOT NULL,
+    geometry public.geometry(Point,_EPSG__CODE_)
+);
+
+
+ALTER TABLE _SURVEY__TEMPLATE_.raw_shots OWNER TO postgres;
+
+--
+-- Name: events_midnight_shot; Type: VIEW; Schema: _SURVEY__TEMPLATE_; Owner: postgres
+--
+
+CREATE VIEW _SURVEY__TEMPLATE_.events_midnight_shot AS
+ WITH t AS (
+         SELECT rs.sequence,
+            min(rs.tstamp) AS ts0,
+            max(rs.tstamp) AS ts1
+           FROM _SURVEY__TEMPLATE_.raw_shots rs
+          GROUP BY rs.sequence, (date(rs.tstamp))
+        ), s AS (
+         SELECT t0.sequence,
+            t0.ts1,
+            t1.ts0
+           FROM (t t0
+             JOIN t t1 ON (((t0.sequence = t1.sequence) AND (date(t0.ts0) < date(t1.ts1)))))
+        )
+ SELECT s.sequence,
+    rs.point AS shot_number,
+    l.name AS label
+   FROM ((s
+     JOIN _SURVEY__TEMPLATE_.raw_shots rs ON ((rs.tstamp = s.ts1)))
+     JOIN _SURVEY__TEMPLATE_.labels l ON ((l.name = 'LDSP'::text)))
+UNION ALL
+ SELECT s.sequence,
+    rs.point AS shot_number,
+    l.name AS label
+   FROM ((s
+     JOIN _SURVEY__TEMPLATE_.raw_shots rs ON ((rs.tstamp = s.ts0)))
+     JOIN _SURVEY__TEMPLATE_.labels l ON ((l.name = 'FDSP'::text)));
+
+
+ALTER TABLE _SURVEY__TEMPLATE_.events_midnight_shot OWNER TO postgres;
+
 --
 -- Name: events_seq; Type: TABLE; Schema: _SURVEY__TEMPLATE_; Owner: postgres
 --
@@ -317,23 +388,6 @@ CREATE TABLE _SURVEY__TEMPLATE_.raw_lines (
 
 ALTER TABLE _SURVEY__TEMPLATE_.raw_lines OWNER TO postgres;
 
---
--- Name: raw_shots; Type: TABLE; Schema: _SURVEY__TEMPLATE_; Owner: postgres
---
-
-CREATE TABLE _SURVEY__TEMPLATE_.raw_shots (
-    sequence integer NOT NULL,
-    line integer NOT NULL,
-    point integer NOT NULL,
-    objref integer NOT NULL,
-    tstamp timestamp with time zone NOT NULL,
-    hash text NOT NULL,
-    geometry public.geometry(Point,_EPSG__CODE_)
-);
-
-
-ALTER TABLE _SURVEY__TEMPLATE_.raw_shots OWNER TO postgres;
-
 --
 -- Name: raw_lines_summary; Type: VIEW; Schema: _SURVEY__TEMPLATE_; Owner: postgres
 --
@@ -431,6 +485,17 @@ UNION
     NULL::text AS remarks
    FROM (_SURVEY__TEMPLATE_.events_seq_shots_labels essl
      LEFT JOIN _SURVEY__TEMPLATE_.raw_shots rs ON (((essl.sequence = rs.sequence) AND (essl.shot_number = rs.point))))
+UNION
+ SELECT 'midnight'::text AS source,
+    NULL::integer AS id,
+    ems.sequence,
+    ems.shot_number,
+    rs.tstamp AS ts0,
+    NULL::timestamp with time zone AS ts1,
+    ems.label,
+    NULL::text AS remarks
+   FROM (_SURVEY__TEMPLATE_.events_midnight_shot ems
+     LEFT JOIN _SURVEY__TEMPLATE_.raw_shots rs ON (((ems.sequence = rs.sequence) AND (ems.shot_number = rs.point))))
 UNION
  SELECT 'seq'::text AS source,
     es.id,
@@ -718,25 +783,6 @@ CREATE TABLE _SURVEY__TEMPLATE_.info (
 
 ALTER TABLE _SURVEY__TEMPLATE_.info OWNER TO postgres;
 
---
--- Name: labels; Type: TABLE; Schema: _SURVEY__TEMPLATE_; Owner: postgres
---
-
-CREATE TABLE _SURVEY__TEMPLATE_.labels (
-    name text NOT NULL,
-    data jsonb NOT NULL
-);
-
-
-ALTER TABLE _SURVEY__TEMPLATE_.labels OWNER TO postgres;
-
---
--- Name: TABLE labels; Type: COMMENT; Schema: _SURVEY__TEMPLATE_; Owner: postgres
---
-
-COMMENT ON TABLE _SURVEY__TEMPLATE_.labels IS 'Labels to attach to events, shots, or anything else really. Each level consists of a (unique) name and a JSON object with arbitrary label properties (intended to be used for label descriptions, colours, etc.)';
-
-
 --
 -- Name: preplot_lines; Type: TABLE; Schema: _SURVEY__TEMPLATE_; Owner: postgres
 --